Merge translation domain (#254)

Since 7ee746a there are few translations in the extra domain now, so it's meaningless to separate translation domains into two to prevent unnecessary ("extra" as it says) translations bundled in the app itself. Rather, some translators may not recognize the extra domain and it remains old or untranslated.

data/meson.build

@@ -10,7 +10,7 @@ endforeach
 i18n.merge_file(
     input: 'reco.desktop.in',
     output: meson.project_name() + '.desktop',
-    po_dir: meson.project_source_root() / 'po' / 'extra',
+    po_dir: meson.project_source_root() / 'po',
     type: 'desktop',
     install: true,
     install_dir: get_option('datadir') / 'applications'
@@ -19,7 +19,7 @@ i18n.merge_file(
 i18n.merge_file(
     input: 'reco.metainfo.xml.in',
     output: meson.project_name() + '.metainfo.xml',
-    po_dir: meson.project_source_root() / 'po' / 'extra',
+    po_dir: meson.project_source_root() / 'po',
     install: true,
     install_dir: get_option('datadir') / 'metainfo'
 )

po/POTFILES

@@ -1,3 +1,5 @@
+data/reco.desktop.in
+data/reco.metainfo.xml.in
 src/MainWindow.vala
 src/Model/Recorder.vala
 src/View/CountDownView.vala