Make the libadwaita change also work on macOS

Same thing, the locales have to be packed so that it works without
Homebrew installed because apparently libadwaita also hardcodes the path
there (I suppose that it is hardcoded to /opt/homebrew/share/locale).

build-aux/macos-build.sh

@@ -50,6 +50,11 @@ glib-compile-schemas "$RESOURCES_ROOT/share/glib-2.0/schemas"
 gtk4-update-icon-cache -q -t -f "$RESOURCES_ROOT/share/icons/hicolor"
 gtk4-update-icon-cache -q -t -f "$RESOURCES_ROOT/share/icons/Adwaita"
 
+# Add extra locales
+for lang in $(cat "po/LINGUAS" | grep -v '^#\|en'); do
+        cp -f $(brew --prefix)/share/locale/$lang/LC_MESSAGES/{gdk-pixbuf,gettext-runtime,glib20,gtk40,gtksourceview-5,libadwaita,shared-mime-info}.mo "$RESOURCES_ROOT/share/locale/$lang/LC_MESSAGES"
+done
+
 # Mangle bin directory
 mv "$RESOURCES_ROOT/bin" "$APP_ROOT/Contents/MacOS"
 

src/main.rs

@@ -109,10 +109,11 @@ fn main() -> glib::ExitCode {
     init_glib();
     init_gio_resources();
 
-    // This is dirty, but because adw_init() calls bindtextdomain() and uses a hardcoded static path,
-    // I need to actually re-bind libadwaita against my own localedir on Windows so that it can use
-    // a path relative to the application executable again.
-    #[cfg(target_os = "windows")]
+    // This is dirty, but because adw_init() calls bindtextdomain() and uses a hardcoded static
+    // path, I need to actually re-bind libadwaita against my own localedir on platforms where the
+    // datadir is not fixed, so that it can use a path relative to the application executable
+    // again.
+    #[cfg(any(target_os = "windows", target_os = "macos"))]
     {
         adw::init().expect("Failed to initialize system runtimes");
         let localedir = app_rel_path("share/locale");