allow workflow dispatch

Author: MattKiazyk

.github/workflows/xcstrings.yml

@@ -1,6 +1,7 @@
 name: XCStrings Validation
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main
@@ -18,4 +19,4 @@ jobs:
     - name: validate translations
       run: |
         swift build --package-path ./SwiftPolyglot --configuration release
-        swift run --package-path ./SwiftPolyglot swiftpolyglot "ca,de,el,es,fi,fr,hi,it,ja,ko,nl,pl,pt-BR,ru,tr,uk,zh-Hans,zh-Hant" --errorOnMissing
+        swift run --package-path ./SwiftPolyglot swiftpolyglot "ca,de,el,es,fi,fr,hi,it,ja,ko,nl,pl,pt-BR,ru,tr,uk,zh-Hans,zh-Hant" --errorOnMissing