ci: Use Slang's Normalisation feature

Author: validcube

.github/workflows/sync_crowdin.yml

@@ -57,6 +57,7 @@ jobs:
         run: |
           dart pub get
           dart run slang
+          dart run slang normalize
           flutter analyze lib/gen/strings.g.dart --no-fatal-infos --no-fatal-warnings
 
       - name: Commit translations