Avoid creating english files when they have not been translated yet.

crowdin.yml

@@ -8,6 +8,8 @@ files:
   - source: app/src/main/res/values/strings.xml
     translation: app/src/main/res/values-%android_code%/%original_file_name%
     type: android
+    skip_untranslated_files: true
+    skip_untranslated_strings: true
     languages_mapping:
       android_code:
         ar: ar