refactor(i18n): final sweep for hardcoded strings and test refactoring

shared/src/main/kotlin/com/example/retroha/i18n/StringKey.kt

@@ -31,6 +31,12 @@ enum class StringKey {
     STATUS_OFFLINE,
     STATUS_ERROR_HA,
     STATUS_NO_TOKEN,
+    TITLE_SELECT_LANGUAGE,
+    STATUS_REFRESHING,
+    STATUS_SUCCESS,
+    TOAST_SAVED_CLEARED,
+    STATUS_ERROR,
+    STATUS_ERROR_NETWORK,
     CONFIRM_DELETE_ALL,
     CONFIRM_CHANGE_CONN,
     DIALOG_BRIGHTNESS,
@@ -39,5 +45,6 @@ enum class StringKey {
     DIALOG_WARNING,
     DIALOG_YES_CHANGE,
     DIALOG_YES_DELETE,
-    TOAST_CLEARED
+    TOAST_CLEARED,
+    TOAST_ENTITIES_SAVED
 }