Add localized language selection and catalog error messages

tools/chatgui-android/app/src/main/res/values-ru/strings.xml

@@ -421,6 +421,8 @@
     <string name="as_video">"Как видео"</string>
     <string name="as_file">"Как файл"</string>
     <string name="interface_language">"Язык интерфейса"</string>
+    <string name="language_load_failed">Не удалось прочитать настройки языка. Повторите попытку.</string>
+    <string name="language_apply_failed">Не удалось изменить язык. Повторите выбор.</string>
     <string name="language_system">"Как в системе"</string>
     <string name="connection_reverse">"обратное"</string>
     <string name="connection_indirect">"непрямое"</string>

tools/chatgui-android/app/src/main/res/values/strings.xml

@@ -422,6 +422,8 @@
     <string name="as_video">"As video"</string>
     <string name="as_file">"As file"</string>
     <string name="interface_language">"Interface language"</string>
+    <string name="language_load_failed">Could not read language settings. Retry.</string>
+    <string name="language_apply_failed">Could not change the language. Select it again.</string>
     <string name="language_system">"Follow system"</string>
     <string name="connection_reverse">"reverse"</string>
     <string name="connection_indirect">"indirect"</string>