chore: add Thai language (#3985)

* Added Thai language

* Complete Thai translation

* feat: Added Thai translation

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Co-authored-by: Lucas.Xu <lucas.xu@appflowy.io>

frontend/appflowy_flutter/lib/startup/tasks/app_widget.dart

@@ -66,6 +66,7 @@ class InitAppWidgetTask extends LaunchTask {
           Locale('pt', 'BR'),
           Locale('ru', 'RU'),
           Locale('sv'),
+          Locale('th', 'TH'),
           Locale('tr', 'TR'),
           Locale('uk', 'UA'),
           Locale('ur'),