build: localize .desktop and .appdata files

Fixes https://github.com/libratbag/piper/issues/257

data/meson.build

@@ -20,10 +20,22 @@ gnome.compile_resources('piper', 'piper.gresource.xml',
 			install: true,
 			install_dir: pkgdatadir)
 
-install_data('org.freedesktop.Piper.desktop', install_dir: desktopdir)
 install_data('org.freedesktop.Piper.svg', install_dir: icondir)
 
-appdata = configure_file(input: 'org.freedesktop.Piper.appdata.xml.in',
-                         output: 'org.freedesktop.Piper.appdata.xml',
-                         configuration: conf,
-                         install_dir: metainfodir)
+i18n.merge_file(input: 'org.freedesktop.Piper.desktop.in',
+                output: 'org.freedesktop.Piper.desktop',
+                type: 'desktop',
+                po_dir: podir,
+                install: true,
+                install_dir: desktopdir)
+
+appdata = configure_file(input: 'org.freedesktop.Piper.appdata.xml.in.in',
+                         output: 'org.freedesktop.Piper.appdata.xml.in',
+                         configuration: conf)
+
+i18n.merge_file(input: appdata,
+                output: 'org.freedesktop.Piper.appdata.xml',
+                type: 'xml',
+                po_dir: podir,
+                install: true,
+                install_dir: metainfodir)

data/org.freedesktop.Piper.desktop

@@ -1,9 +0,0 @@
-[Desktop Entry]
-Name=Piper
-Comment=Configurable mouse configuration utility
-Exec=piper
-Icon=org.freedesktop.Piper
-Type=Application
-StartupNotify=true
-Categories=GTK;GNOME;Utility;
-Keywords=gaming;configuration;mouse;mice;

data/org.freedesktop.Piper.desktop.in

@@ -0,0 +1,11 @@
+[Desktop Entry]
+Name=Piper
+Comment=Configurable mouse configuration utility
+Exec=piper
+# Translators: Do NOT translate or transliterate this text (this is an icon file name)!
+Icon=org.freedesktop.Piper
+Type=Application
+StartupNotify=true
+Categories=GTK;GNOME;Utility;
+# Translators: Search terms to find this application. Do NOT translate or localize the semicolons! The list MUST also end with a semicolon!
+Keywords=gaming;configuration;mouse;mice;

meson.build

@@ -45,6 +45,9 @@ datadir = join_paths(prefix, get_option('datadir'))
 localedir = join_paths(prefix, get_option('localedir'))
 pkgdatadir = join_paths(datadir, meson.project_name())
 bindir = join_paths(prefix, get_option('bindir'))
+podir = join_paths(meson.source_root(), 'po')
+
+i18n = import('i18n')
 
 subdir('data')
 subdir('po')

po/POTFILES

@@ -1,3 +1,6 @@
+data/org.freedesktop.Piper.desktop.in
+data/org.freedesktop.Piper.appdata.xml.in.in
+
 piper/__init__.py
 piper/application.py
 piper/buttondialog.py

po/meson.build

@@ -1,3 +1 @@
-i18n = import('i18n')
-
 i18n.gettext('piper', preset: 'glib')