Fixed problem with translation key gen

frontend/scripts/generate_language_files.cmd

@@ -1,4 +1,4 @@
 echo 'Generating language files'
 cd app_flowy
 
-flutter pub run easy_localization:generate -S assets/translations/ && flutter pub run easy_localization:generate -f keys -o locale_keys.g.dart -S assets/translations/
+flutter pub run easy_localization:generate -S assets/translations/ && flutter pub run easy_localization:generate -f keys -o locale_keys.g.dart -S assets/translations/ -s en.json

frontend/scripts/generate_language_files.sh

@@ -3,4 +3,4 @@
 echo 'Generating language files'
 cd app_flowy
 flutter pub run easy_localization:generate -S assets/translations/
-flutter pub run easy_localization:generate -f keys -o locale_keys.g.dart -S assets/translations
+flutter pub run easy_localization:generate -f keys -o locale_keys.g.dart -S assets/translations -s en.json