fix: restore missing .lproj directories (electron#15721)

the empty lproj directories help macOS to understand what locales the app supports

BUILD.gn

@@ -665,9 +665,40 @@ if (is_mac) {
     ]
   }
 
+  action("electron_app_lproj_dirs") {
+    outputs = []
+
+    foreach(locale, locales_as_mac_outputs) {
+      outputs += [ "$target_gen_dir/app_infoplist_strings/$locale.lproj" ]
+    }
+    script = "build/mac/make_locale_dirs.py"
+    args = rebase_path(outputs)
+  }
+
+  foreach(locale, locales_as_mac_outputs) {
+    bundle_data("electron_app_strings_${locale}_bundle_data") {
+      sources = [
+        "$target_gen_dir/app_infoplist_strings/$locale.lproj",
+      ]
+      outputs = [
+        "{{bundle_resources_dir}}/$locale.lproj",
+      ]
+      public_deps = [
+        ":electron_app_lproj_dirs",
+      ]
+    }
+  }
+  group("electron_app_strings_bundle_data") {
+    public_deps = []
+    foreach(locale, locales_as_mac_outputs) {
+      public_deps += [ ":electron_app_strings_${locale}_bundle_data" ]
+    }
+  }
+
   bundle_data("electron_app_resources") {
     public_deps = [
       ":app2asar",
+      ":electron_app_strings_bundle_data",
       ":js2asar",
     ]
     sources = [

build/mac/make_locale_dirs.py

@@ -0,0 +1,20 @@
+# usage: make_locale_dirs.py locale_dir [...]
+#
+# This script is intended to create empty locale directories (.lproj) in a
+# Cocoa .app bundle. The presence of these empty directories is sufficient to
+# convince Cocoa that the application supports the named localization, even if
+# an InfoPlist.strings file is not provided. Chrome uses these empty locale
+# directoires for its helper executable bundles, which do not otherwise
+# require any direct Cocoa locale support.
+
+import os
+import sys
+
+
+def main(args):
+  for dirname in args:
+    os.makedirs(dirname)
+
+
+if __name__ == '__main__':
+  main(sys.argv[1:])