diff --git a/components/AutocompleteSelect.vue b/components/AutocompleteSelect.vue
index 1917345b5..ea7062f41 100644
--- a/components/AutocompleteSelect.vue
+++ b/components/AutocompleteSelect.vue
@@ -5,7 +5,7 @@
             v-model="filter"
             type="text"
             class="form-control"
-            :placeholder="$t('profile.timezone.placeholder')"
+            v-bind="$attrs"
             @focus="show"
             @blur="hide"
             @keydown="filterKeydown"
@@ -26,9 +26,11 @@
 <script>
 
 export default {
+    inheritAttrs: false,
     props: {
         value: {},
         options: { required: true },
+        freeform: { type: Boolean },
     },
     data() {
         return {
@@ -47,6 +49,11 @@ export default {
             this.filter = this.options[this.value] || this.value;
             this.highlighted = -1;
         },
+        filter() {
+            if (this.freeform) {
+                this.$emit('input', this.filter);
+            }
+        },
     },
     methods: {
         select(option) {
diff --git a/components/SourceSubmitForm.vue b/components/SourceSubmitForm.vue
index 8d0cbfcb7..032cbcb11 100644
--- a/components/SourceSubmitForm.vue
+++ b/components/SourceSubmitForm.vue
@@ -140,15 +140,16 @@
                 </div>
                 <div v-if="$isGranted('sources')" class="form-group">
                     <label for="key"><T>sources.submit.key</T></label>
-                    <input
+                    <AutocompleteSelect
                         id="key"
                         v-model="form.key"
-                        type="text"
-                        class="form-control"
                         maxlength="255"
-                    >
+                        :options="keys"
+                        freeform
+                    />
                     <p class="small text-muted">
                         <T>sources.submit.keyInfo</T>
+                        <T>sources.submit.keyInfoConvention</T>
                     </p>
                 </div>
                 <div v-if="form.base" class="alert alert-info">
@@ -199,6 +200,7 @@ interface Data {
     submitting: boolean;
     afterSubmit: boolean;
     pronounLibrary: PronounLibrary;
+    keys: Record<string, string>;
 }
 
 export default Vue.extend({
@@ -226,8 +228,13 @@ export default Vue.extend({
             afterSubmit: false,
 
             pronounLibrary,
+
+            keys: {},
         };
     },
+    async mounted() {
+        this.keys = await this.$axios.$get('/sources/keys');
+    },
     methods: {
         async submit(): Promise<void> {
             this.submitting = true;
diff --git a/components/TermsSubmitForm.vue b/components/TermsSubmitForm.vue
index 54bdddc31..a8303f336 100644
--- a/components/TermsSubmitForm.vue
+++ b/components/TermsSubmitForm.vue
@@ -53,9 +53,10 @@
             <div class="row">
                 <div class="col-12 col-lg-4">
                     <label for="key"><strong><T>sources.submit.key</T></strong></label>
-                    <input id="key" v-model="form.key" type="text" class="form-control" maxlength="255">
+                    <AutocompleteSelect v-model="form.key" :options="keys" maxlength="255" freeform />
                     <p class="small text-muted">
                         <T>sources.submit.keyInfo</T>
+                        <T>sources.submit.keyInfoConvention</T>
                     </p>
                 </div>
                 <div class="col-12 col-lg-4">
@@ -122,6 +123,7 @@ interface Data {
     };
     submitting: boolean;
     afterSubmit: boolean;
+    keys: Record<string, string>,
 }
 
 export default Vue.extend({
@@ -139,8 +141,12 @@ export default Vue.extend({
             },
             submitting: false,
             afterSubmit: false,
+            keys: {},
         };
     },
+    async mounted() {
+        this.keys = await this.$axios.$get('/terms/keys');
+    },
     methods: {
         async submit(): Promise<void> {
             this.submitting = true;
diff --git a/components/TimezoneSelect.vue b/components/TimezoneSelect.vue
index c1fa3a04c..e471d61ba 100644
--- a/components/TimezoneSelect.vue
+++ b/components/TimezoneSelect.vue
@@ -5,7 +5,7 @@
                 <Icon v="location" />
                 <T>profile.timezone.detect</T>
             </button>
-            <AutocompleteSelect v-model="timezone" :options="timezones" />
+            <AutocompleteSelect v-model="timezone" :options="timezones" :placeholder="$t('profile.timezone.placeholder')" />
             <button v-if="timezone" class="btn btn-outline-danger" type="button" @click="timezone = null">
                 <Icon v="times" />
             </button>
diff --git a/locale/_base/translations.suml b/locale/_base/translations.suml
index 28e381750..286355d71 100644
--- a/locale/_base/translations.suml
+++ b/locale/_base/translations.suml
@@ -139,7 +139,8 @@ sources:
         another: 'Submit another one'
         moderation: 'Submissions will have to get approved before getting published.'
         key: 'Key'
-        keyInfo: 'Identifier for linking sources between language versions and linking with the dictionary'
+        keyInfo: 'Identifier for linking sources between language versions and linking with the dictionary.'
+        keyInfoConvention: 'Ideally: the simplest form of the term, in English, in lower-case.'
         images: 'Images'
         spoiler: 'Spoiler'
     otherVersions: 'In other languages'
diff --git a/locale/de/translations.suml b/locale/de/translations.suml
index a0e1a00f6..102e6df37 100644
--- a/locale/de/translations.suml
+++ b/locale/de/translations.suml
@@ -151,7 +151,7 @@ sources:
         another: 'Ein weiteres Beispiel einreichen'
         moderation: 'Einreichungen müssen erst genehmigt werden, bevor sie veröffentlicht werden.'
         key: 'Schlüssel'
-        keyInfo: 'Kennzeichen, um Quellen zwischen Sprachversionen und dem Wörterbuch zu verbinden'
+        keyInfo: 'Kennzeichen, um Quellen zwischen Sprachversionen und dem Wörterbuch zu verbinden.'
         images: 'Bilder'
         spoiler: 'Spoiler'
     otherVersions: 'In anderen Sprachen'
diff --git a/locale/en/translations.suml b/locale/en/translations.suml
index 599f6e8c9..6fd0394e6 100644
--- a/locale/en/translations.suml
+++ b/locale/en/translations.suml
@@ -137,7 +137,8 @@ sources:
         another: 'Submit another one'
         moderation: 'Submissions will have to get approved before getting published.'
         key: 'Key'
-        keyInfo: 'Identifier for linking sources between language versions and linking with the dictionary'
+        keyInfo: 'Identifier for linking sources between language versions and linking with the dictionary.'
+        keyInfoConvention: 'Ideally: the simplest form of the term, in English, in lower-case.'
         images: 'Images'
         spoiler: 'Spoiler'
     otherVersions: 'In other languages'
diff --git a/locale/eo/translations.suml b/locale/eo/translations.suml
index 397dfd21d..f3402cfaf 100644
--- a/locale/eo/translations.suml
+++ b/locale/eo/translations.suml
@@ -101,7 +101,7 @@ sources:
         another: 'Alsendi pluan'
         moderation: 'Alsendaĵoj estas aprobendaj antaŭ ol publikigo.'
         key: 'Ŝlosilo'
-        keyInfo: 'Identigilo por ligi fontojn inter lingvoversiojn kaj ligado al la vortaro'
+        keyInfo: 'Identigilo por ligi fontojn inter lingvoversiojn kaj ligado al la vortaro.'
         images: 'Bildoj'
     otherVersions: 'En aliaj lingvoj'
     referenced: 'Ekzemploj de uzo'
diff --git a/locale/es/translations.suml b/locale/es/translations.suml
index 0285f3fbf..724f4689d 100644
--- a/locale/es/translations.suml
+++ b/locale/es/translations.suml
@@ -128,7 +128,7 @@ sources:
         another: 'Enviar otro'
         moderation: 'Los envíos deben ser aprobados antes de ser publicados.'
         key: 'Clave'
-        keyInfo: 'Identificador para vincular fuentes entre versiones en varios idiomas y vincularlas con el diccionario'
+        keyInfo: 'Identificador para vincular fuentes entre versiones en varios idiomas y vincularlas con el diccionario.'
         images: 'Imágenes'
         spoiler: 'Spoiler'
         fragmentsInfo: >
diff --git a/locale/et/translations.suml b/locale/et/translations.suml
index a61f0dd30..5416d8a62 100644
--- a/locale/et/translations.suml
+++ b/locale/et/translations.suml
@@ -100,7 +100,7 @@ sources:
         another: 'Esita veel üks'
         moderation: 'Esitatud viited kinnitatakse enne avaldamist moderaatori poolt.'
         key: 'Võti'
-        keyInfo: 'Identifikaator allikate sidumiseks keeleversioonide vahel ning sõnastikuga'
+        keyInfo: 'Identifikaator allikate sidumiseks keeleversioonide vahel ning sõnastikuga.'
         images: 'Pildid'
         spoiler: 'Spoiler'
     otherVersions: 'Teistes keeltes'
diff --git a/locale/fr/translations.suml b/locale/fr/translations.suml
index 00ca3d2ff..0305aab2e 100644
--- a/locale/fr/translations.suml
+++ b/locale/fr/translations.suml
@@ -118,7 +118,7 @@ sources:
         thanks: 'Merci de votre contribution !'
         another: 'Soumettre un autre exemple'
         moderation: 'Les soumissions devront être approuvées avant d’être publiées.'
-        keyInfo: 'Identifiant pour relier les sources entre les versions linguistiques et établir des liens avec le dictionnaire'
+        keyInfo: 'Identifiant pour relier les sources entre les versions linguistiques et établir des liens avec le dictionnaire.'
         images: 'Images'
         spoiler: 'Spoiler'
     otherVersions: 'Dans d’autres langues'
diff --git a/locale/gl/translations.suml b/locale/gl/translations.suml
index 995fff0a2..a2f8c151c 100644
--- a/locale/gl/translations.suml
+++ b/locale/gl/translations.suml
@@ -115,7 +115,7 @@ sources:
         another: 'Enviar outro'
         moderation: 'Os envios devem ser aprovados antes de serem publicados.'
         key: 'Chave'
-        keyInfo: 'Identificador para conectar fontes entre versões e conectar com dicionário'
+        keyInfo: 'Identificador para conectar fontes entre versões e conectar com dicionário.'
         images: 'Imagens'
         spoiler: 'Spoiler' # TODO
     otherVersions: 'Em outros idiomas'
diff --git a/locale/it/translations.suml b/locale/it/translations.suml
index 4b9052e4e..edd98e4c2 100644
--- a/locale/it/translations.suml
+++ b/locale/it/translations.suml
@@ -128,7 +128,7 @@ sources:
         another: 'Inviane un altro'
         moderation: 'Il materiale  deve essere approvato prima della sua pubblicazione.'
         key: 'Chiave'
-        keyInfo: 'Identificativo per collegare fonti tra lingue diverse e collegarle con il dizionario'
+        keyInfo: 'Identificativo per collegare fonti tra lingue diverse e collegarle con il dizionario.'
         images: 'Immagini'
     otherVersions: 'In altre lingue'
     referenced: 'Esempi di utilizzo'
diff --git a/locale/ja/translations.suml b/locale/ja/translations.suml
index 6969796f3..7d1d05c0d 100644
--- a/locale/ja/translations.suml
+++ b/locale/ja/translations.suml
@@ -101,7 +101,7 @@ sources:
         another: 'もう一つ送信'
         moderation: '承認されるまで投稿は公開されません。'
         key: 'キー'
-        keyInfo: '言語間、及び辞書とリンクするのための識別子'
+        keyInfo: '言語間、及び辞書とリンクするのための識別子。'
         images: '画像'
         spoiler: 'ネタバレ'
     otherVersions: '他の言語で'
diff --git a/locale/ko/translations.suml b/locale/ko/translations.suml
index cbc8d4571..c07fe409b 100644
--- a/locale/ko/translations.suml
+++ b/locale/ko/translations.suml
@@ -118,7 +118,7 @@ sources:
         another: '제출 더하기'
         moderation: '제출물은 먼저 승인받아야합니다.'
         key: '키'
-        keyInfo: '언어 버전 간 소스 연결 및 사전 연결 식별자'
+        keyInfo: '언어 버전 간 소스 연결 및 사전 연결 식별자.'
         images: '이미지'
         spoiler: '스포주의'
     otherVersions: '다른 언어'
diff --git a/locale/lad/translations.suml b/locale/lad/translations.suml
index fb667cbf9..4759ac00e 100644
--- a/locale/lad/translations.suml
+++ b/locale/lad/translations.suml
@@ -117,7 +117,7 @@ sources:
         another: 'Embiar otruno'
         moderation: 'Los embios deven ser aseptados antes de ser publikados.'
         key: 'Yave'
-        keyInfo: 'Identifiador para atar manaderos entre versiones en varias linguas i atarlas kon el diksionaryo'
+        keyInfo: 'Identifiador para atar manaderos entre versiones en varias linguas i atarlas kon el diksionaryo.'
         images: 'Imajes'
         spoiler: 'Spoiler'
     otherVersions: 'En otras linguas'
diff --git a/locale/nl/translations.suml b/locale/nl/translations.suml
index d98583254..1029bb5de 100644
--- a/locale/nl/translations.suml
+++ b/locale/nl/translations.suml
@@ -116,7 +116,7 @@ sources:
         another: 'Dien nog een voorbeeld in'
         moderation: 'Inzendingen zullen moeten worden goedgekeurd alvorens te worden gepubliceerd.'
         key: 'Sleutel'
-        keyInfo: 'Identifier om bronnen te linken tussen verschillende vertalingen van de website en om met het woordenboek te linken'
+        keyInfo: 'Identifier om bronnen te linken tussen verschillende vertalingen van de website en om met het woordenboek te linken.'
         images: 'Afbeeldingen'
         spoiler: 'Spoiler'
     otherVersions: 'In andere talen'
diff --git a/locale/no/translations.suml b/locale/no/translations.suml
index ad5f7f458..8d2848fc9 100644
--- a/locale/no/translations.suml
+++ b/locale/no/translations.suml
@@ -110,7 +110,7 @@ sources:
         another: 'Legg til en til'
         moderation: 'Bidrag må bli vurdert og godtatt før de blir lagt ut.'
         key: 'Nøkkel'
-        keyInfo: 'identifiserer for å linke kilder mellom språkversjoner og linker med ordboken'
+        keyInfo: 'identifiserer for å linke kilder mellom språkversjoner og linker med ordboken.'
         images: 'Bilder'
         spoiler: 'Sladd'
     otherVersions: 'På andre språk'
diff --git a/locale/pl/translations.suml b/locale/pl/translations.suml
index e776ae3e6..f6976c46d 100644
--- a/locale/pl/translations.suml
+++ b/locale/pl/translations.suml
@@ -141,7 +141,8 @@ sources:
         another: 'Zgłoś kolejne źródło'
         moderation: 'Propozycje będą musiały zostać zatwierdzone przed opublikowaniem.'
         key: 'Klucz'
-        keyInfo: 'Identyfikator do łączenia tekstów między wersjami językowymi i łączenia ze słownikiem'
+        keyInfo: 'Identyfikator do łączenia tekstów między wersjami językowymi i łączenia ze słownikiem.'
+        keyInfoConvention: 'Najlepiej: najprostsza forma wpisu, po angielsku, małymi literami.'
         images: 'Obrazki'
         spoiler: 'Spoiler'
     otherVersions: 'W innych językach'
diff --git a/locale/pt/translations.suml b/locale/pt/translations.suml
index 29e6c2219..269b76d11 100644
--- a/locale/pt/translations.suml
+++ b/locale/pt/translations.suml
@@ -126,7 +126,7 @@ sources:
         another: 'Enviar outro'
         moderation: 'Os envios devem ser aprovados antes de serem publicados.'
         key: 'Chave'
-        keyInfo: 'Identificador para conectar fontes entre versões e conectar com dicionário'
+        keyInfo: 'Identificador para conectar fontes entre versões e conectar com dicionário.'
         images: 'Imagens'
         spoiler: 'Spoiler'
         fragmentsInfo: >
diff --git a/locale/ru/translations.suml b/locale/ru/translations.suml
index e248f6401..7cfca8754 100644
--- a/locale/ru/translations.suml
+++ b/locale/ru/translations.suml
@@ -122,7 +122,7 @@ sources:
         another: 'Добавить ещё'
         moderation: 'Предложения должны быть одобрены перед публикацией.'
         key: 'Ключ'
-        keyInfo: 'Идентификатор, используемый для связки источников из разных языковых версий и связки со словарём'
+        keyInfo: 'Идентификатор, используемый для связки источников из разных языковых версий и связки со словарём.'
         images: 'Изображения'
         spoiler: 'Спойлер'
     otherVersions: 'На других языках'
diff --git a/locale/sv/translations.suml b/locale/sv/translations.suml
index bb9212b76..31d41d010 100644
--- a/locale/sv/translations.suml
+++ b/locale/sv/translations.suml
@@ -122,7 +122,7 @@ sources:
         another: 'Skicka in en till'
         moderation: 'Bidragen måste godkännas innan de publiceras.'
         key: 'Nyckel'
-        keyInfo: 'Identifierare för att länka källor mellan språkversioner och länka till ordbok'
+        keyInfo: 'Identifierare för att länka källor mellan språkversioner och länka till ordbok.'
         images: 'Bilder'
         spoiler: 'Spoiler' # Swedish just takes the word spoiler directly
     otherVersions: 'På andra språk'
diff --git a/locale/vi/translations.suml b/locale/vi/translations.suml
index 103fa787d..7a2de64dc 100644
--- a/locale/vi/translations.suml
+++ b/locale/vi/translations.suml
@@ -128,7 +128,7 @@ sources:
         another: 'Gửi thêm'
         moderation: 'Các ví dụ sẽ phải được phê duyệt trước khi được thêm vào.'
         key: 'Mã định danh'
-        keyInfo: 'Mã định danh để liên kết các nguồn ở các phiên bản ngôn ngữ khác và liên kết với từ điển'
+        keyInfo: 'Mã định danh để liên kết các nguồn ở các phiên bản ngôn ngữ khác và liên kết với từ điển.'
         images: 'Ảnh'
         spoiler: 'Spoiler'
     otherVersions: 'Trong các ngôn ngữ khác'
diff --git a/locale/zh/translations.suml b/locale/zh/translations.suml
index 48fe3d48c..c264ef078 100644
--- a/locale/zh/translations.suml
+++ b/locale/zh/translations.suml
@@ -119,7 +119,7 @@ sources:
         another: '提交另一個'
         moderation: '提交的內容必須先獲得批准才能發布。'
         key: '鍵' # TODO
-        keyInfo: '用於在語言版本之間連接源並與字典連接的標誌符'
+        keyInfo: '用於在語言版本之間連接源並與字典連接的標誌符。'
         images: '意象'
         spoiler: '劇透內容'
     otherVersions: '在其他語言'
diff --git a/server/routes/sources.ts b/server/routes/sources.ts
index 9a53697d5..48da51f90 100644
--- a/server/routes/sources.ts
+++ b/server/routes/sources.ts
@@ -95,17 +95,6 @@ router.get('/sources', handleErrorAsync(async (req, res) => {
     return res.json(await linkOtherVersions(req, await req.db.all(sql)));
 }));
 
-router.get('/sources/:id', handleErrorAsync(async (req, res) => {
-    return res.json(await linkOtherVersions(req, await req.db.all(SQL`
-        SELECT s.*, u.username AS submitter FROM sources s
-        LEFT JOIN users u ON s.submitter_id = u.id
-        WHERE s.locale = ${global.config.locale}
-        AND s.deleted = 0
-        AND s.approved >= ${req.isGranted('sources') ? 0 : 1}
-        AND s.id = ${req.params.id}
-    `)));
-}));
-
 router.post('/sources/submit', handleErrorAsync(async (req, res) => {
     if (!req.user || !await req.isUserAllowedToPost()) {
         return res.status(401).json({ error: 'Unauthorised' });
@@ -176,4 +165,31 @@ router.post('/sources/remove/:id', handleErrorAsync(async (req, res) => {
     return res.json('ok');
 }));
 
+router.get('/sources/keys', handleErrorAsync(async (req, res) => {
+    const keys = await req.db.all<{ key: string }>(SQL`
+        SELECT trim(key) AS key
+        FROM sources
+        WHERE key IS NOT NULL
+          AND deleted = 0
+          AND approved = 1
+        GROUP BY key
+        ORDER BY key
+    `);
+
+    return res.json(
+        Object.fromEntries(keys.map((k) => [k.key, k.key])),
+    );
+}));
+
+router.get('/sources/:id', handleErrorAsync(async (req, res) => {
+    return res.json(await linkOtherVersions(req, await req.db.all(SQL`
+        SELECT s.*, u.username AS submitter FROM sources s
+        LEFT JOIN users u ON s.submitter_id = u.id
+        WHERE s.locale = ${global.config.locale}
+        AND s.deleted = 0
+        AND s.approved >= ${req.isGranted('sources') ? 0 : 1}
+        AND s.id = ${req.params.id}
+    `)));
+}));
+
 export default router;
diff --git a/server/routes/terms.ts b/server/routes/terms.ts
index 816d79758..87b69d202 100644
--- a/server/routes/terms.ts
+++ b/server/routes/terms.ts
@@ -174,4 +174,20 @@ router.post('/terms/remove/:id', handleErrorAsync(async (req, res) => {
     return res.json('ok');
 }));
 
+router.get('/terms/keys', handleErrorAsync(async (req, res) => {
+    const keys = await req.db.all<{ key: string }>(SQL`
+        SELECT trim(key) AS key
+        FROM terms
+        WHERE key IS NOT NULL
+          AND deleted = 0
+          AND approved = 1
+        GROUP BY key
+        ORDER BY key
+    `);
+
+    return res.json(
+        Object.fromEntries(keys.map((k) => [k.key, k.key])),
+    );
+}));
+
 export default router;