fix(i18n): add i18n support for steve & alex option in offline skin pane (#3630)

Some Slavic Minecraft communities have translated Steve and Alex,
such as Russian and Ukrainian. They need a translation.

ref:
- https://ru.minecraft.wiki/w/%D0%A1%D0%BA%D0%B8%D0%BD
- https://uk.minecraft.wiki/w/%D0%A1%D0%BA%D1%96%D0%BD

HMCL/src/main/java/org/jackhuang/hmcl/ui/account/OfflineAccountSkinPane.java

@@ -108,8 +108,8 @@ public class OfflineAccountSkinPane extends StackPane {
 
         skinItem.loadChildren(Arrays.asList(
                 new MultiFileItem.Option<>(i18n("message.default"), Skin.Type.DEFAULT),
-                new MultiFileItem.Option<>("Steve", Skin.Type.STEVE),
-                new MultiFileItem.Option<>("Alex", Skin.Type.ALEX),
+                new MultiFileItem.Option<>(i18n("account.skin.type.steve"), Skin.Type.STEVE),
+                new MultiFileItem.Option<>(i18n("account.skin.type.alex"), Skin.Type.ALEX),
                 new MultiFileItem.Option<>(i18n("account.skin.type.local_file"), Skin.Type.LOCAL_FILE),
                 new MultiFileItem.Option<>("LittleSkin", Skin.Type.LITTLE_SKIN),
                 new MultiFileItem.Option<>(i18n("account.skin.type.csl_api"), Skin.Type.CUSTOM_SKIN_LOADER_API)

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -147,12 +147,14 @@ account.skin.file=Skin File
 account.skin.model=Model
 account.skin.model.default=Classic
 account.skin.model.slim=Slim
+account.skin.type.alex=Alex
 account.skin.type.csl_api=Blessing Skin
 account.skin.type.csl_api.location=Address
 account.skin.type.csl_api.location.hint=CustomSkinAPI URL
 account.skin.type.little_skin=LittleSkin
 account.skin.type.little_skin.hint=You need to create a player with the same player name as your offline account on your skin provider site. Your skin will now be set to the skin assigned to your player on the skin provider site.
 account.skin.type.local_file=Local Skin File
+account.skin.type.steve=Steve
 account.skin.upload=Upload/Edit Skin
 account.skin.upload.failed=Failed to upload skin.
 account.skin.invalid_skin=Invalid skin file.

HMCL/src/main/resources/assets/lang/I18N_ru.properties

@@ -123,12 +123,14 @@ account.skin.file=Файл скина
 account.skin.model=Модель
 account.skin.model.default=Классическая
 account.skin.model.slim=Стройная
+account.skin.type.alex=Алекс
 account.skin.type.csl_api=Blessing Skin
 account.skin.type.csl_api.location=Адрес
 account.skin.type.csl_api.location.hint=URL-адрес CustomSkinAPI
 account.skin.type.little_skin=LittleSkin
 account.skin.type.little_skin.hint=Необходимо создать персонажа с тем же именем, что и на автономном аккаунте на сайте поставщика скинов. Затем ваш скин будет вашим загруженным скином на этот сайт.
 account.skin.type.local_file=Локальный файл скина
+account.skin.type.steve=Стив
 account.skin.upload=Загрузить скин
 account.skin.upload.failed=Не удаётся загрузить скин
 account.skin.invalid_skin=Недопустимый файл скина

HMCL/src/main/resources/assets/lang/I18N_zh.properties

@@ -148,12 +148,14 @@ account.skin.file=外觀圖片檔案
 account.skin.model=模型
 account.skin.model.default=寬型
 account.skin.model.slim=纖細
+account.skin.type.alex=Alex
 account.skin.type.csl_api=Blessing Skin 伺服器
 account.skin.type.csl_api.location=伺服器位址
 account.skin.type.csl_api.location.hint=CustomSkinAPI 位址
 account.skin.type.little_skin=LittleSkin 皮膚站
 account.skin.type.little_skin.hint=你需要在皮膚站中加入並使用和該離線帳戶同名角色，此時離線帳戶外觀將為皮膚站上對應角色所設定的外觀。
 account.skin.type.local_file=本機外觀圖片檔案
+account.skin.type.steve=Steve
 account.skin.upload=上傳/編輯外觀
 account.skin.upload.failed=外觀上傳失敗
 account.skin.invalid_skin=無法識別的外觀檔案

HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties

@@ -157,12 +157,14 @@ account.skin.file=皮肤图片文件
 account.skin.model=模型
 account.skin.model.default=宽型
 account.skin.model.slim=纤细
+account.skin.type.alex=Alex
 account.skin.type.csl_api=Blessing Skin 服务器
 account.skin.type.csl_api.location=服务器地址
 account.skin.type.csl_api.location.hint=CustomSkinAPI 地址
 account.skin.type.little_skin=LittleSkin 皮肤站
 account.skin.type.little_skin.hint=你需要在皮肤站中创建并使用和该离线账户同名的角色，此时离线账户皮肤将显示为皮肤站上对应角色所设置的皮肤。\n你可以点击右上角帮助按钮进行求助。
 account.skin.type.local_file=本地皮肤图片文件
+account.skin.type.steve=Steve
 account.skin.upload=上传/编辑皮肤
 account.skin.upload.failed=皮肤上传失败
 account.skin.invalid_skin=无法识别的皮肤文件