diff --git a/app/src/main/java/org/kiwix/kiwixmobile/language/LanguageActivity.kt b/app/src/main/java/org/kiwix/kiwixmobile/language/LanguageActivity.kt
index 387c5c401..43ebcce67 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/language/LanguageActivity.kt
+++ b/app/src/main/java/org/kiwix/kiwixmobile/language/LanguageActivity.kt
@@ -34,7 +34,7 @@ class LanguageActivity : BaseActivity() {
 
   @Inject lateinit var viewModelFactory: ViewModelProvider.Factory
 
-  val compositeDisposable = CompositeDisposable()
+  private val compositeDisposable = CompositeDisposable()
 
   private val languageAdapter =
     LanguageAdapter(
@@ -75,7 +75,7 @@ class LanguageActivity : BaseActivity() {
     compositeDisposable.clear()
   }
 
-  fun render(state: State) = when (state) {
+  private fun render(state: State) = when (state) {
     Loading -> language_progressbar.show()
     is Content -> {
       language_progressbar.hide()
diff --git a/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageDelegate.kt b/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageDelegate.kt
index 08cbde435..8997a0ab1 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageDelegate.kt
+++ b/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageDelegate.kt
@@ -20,7 +20,7 @@ sealed class LanguageDelegate<I : LanguageListItem, VH : LanguageListViewHolder<
 
   }
 
-  class LanguageItemDelegate(val clickAction: (LanguageItem) -> Unit) : LanguageDelegate<LanguageItem, LanguageViewHolder>() {
+  class LanguageItemDelegate(private val clickAction: (LanguageItem) -> Unit) : LanguageDelegate<LanguageItem, LanguageViewHolder>() {
     override val itemClass = LanguageItem::class.java
 
     override fun createViewHolder(parent: ViewGroup) =
diff --git a/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListItem.kt b/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListItem.kt
index 7842fe4bf..3450d467d 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListItem.kt
+++ b/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListItem.kt
@@ -8,7 +8,7 @@ sealed class LanguageListItem {
   data class HeaderItem constructor(
     override val id: Long
   ) : LanguageListItem() {
-    companion object{
+    companion object {
       const val SELECTED = Long.MAX_VALUE
       const val OTHER = Long.MIN_VALUE
     }
diff --git a/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListViewHolder.kt b/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListViewHolder.kt
index 1c4441880..f8ac59493 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListViewHolder.kt
+++ b/app/src/main/java/org/kiwix/kiwixmobile/language/adapter/LanguageListViewHolder.kt
@@ -34,7 +34,7 @@ sealed class LanguageListViewHolder<T : LanguageListItem>(override val container
       item_language_books_count.text = containerView.resources.getQuantityString(
           R.plurals.books_count, language.occurencesOfLanguage, language.occurencesOfLanguage
       )
-      item_language_checkbox.isChecked = language.active;
+      item_language_checkbox.isChecked = language.active
       item_language_clickable_area.setOnClickListener { clickAction(item) }
     }
 
diff --git a/app/src/main/java/org/kiwix/kiwixmobile/language/viewmodel/State.kt b/app/src/main/java/org/kiwix/kiwixmobile/language/viewmodel/State.kt
index a49febd60..02be4c9e0 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/language/viewmodel/State.kt
+++ b/app/src/main/java/org/kiwix/kiwixmobile/language/viewmodel/State.kt
@@ -5,7 +5,7 @@ import org.kiwix.kiwixmobile.language.adapter.LanguageListItem.HeaderItem
 import org.kiwix.kiwixmobile.language.adapter.LanguageListItem.LanguageItem
 import org.kiwix.kiwixmobile.zim_manager.Language
 
-sealed class State() {
+sealed class State {
   object Loading : State()
   object Saving : State()
   data class Content(