Ensure downloaded .strings files are committed

And update other "`.strings` update" commit message to differentiate the two steps

fastlane/lanes/localization.rb

@@ -195,13 +195,23 @@
       locales: GLOTPRESS_TO_LPROJ_APP_LOCALE_CODES,
       download_dir: parent_dir_for_lprojs
     )
+    git_commit(
+      path: File.join(parent_dir_for_lprojs, '*.lproj', 'Localizable.strings'),
+      message: 'Update app translations – `Localizable.strings`',
+      allow_nothing_to_commit: true
+    )
 
-    # Then redispatch the appropriate subset of translations back to the `InfoPlist.strings` and `Sites.strings` files in corresponding `*.lproj` dirs
+    # Redispatch the appropriate subset of translations back to the manually-maintained `.strings`
+    # files that we previously merged via `ios_merge_strings_files` during `complete_code_freeze`
     modified_files = ios_extract_keys_from_strings_files(
       source_parent_dir: parent_dir_for_lprojs,
       target_original_files: MANUALLY_MAINTAINED_STRINGS_FILES
     )
-    git_commit(path: modified_files, message: 'Update app translations', allow_nothing_to_commit: true)
+    git_commit(
+      path: modified_files,
+      message: 'Update app translations – Other `.strings`',
+      allow_nothing_to_commit: true
+    )
 
     # Finally, also download the AppStore metadata (app title, keywords, etc.)
     # @FIXME: Replace this whole lane with a call to the future replacement of `gp_downloadmetadata` once it's implemented in the release-toolkit (see paaHJt-31O-p2).