[meson] check-po target

Usage:
ninja check-po 2>&1 | less

po/check_po.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+SRC=$(dirname -- ${BASH_SOURCE[0]})
+
+for po in "$SRC"/*.po
+do
+	lang=$(basename $po .po)
+	echo -n "$lang"
+	msgfmt --check --check-accelerators="~" --verbose --statistics -o /dev/null "$SRC/$lang.po"
+	perl -I"$SRC/perl" "$SRC/perl/msgaccel-check" "$SRC/$lang.po"
+done

po/meson.build

@@ -6,3 +6,6 @@ if conf_data.get('CONFIG_NLS')
         args: '--directory=' + meson.source_root()
     )
 endif
+
+check_po_sh = find_program('check_po.sh')
+run_target('check-po', command:[check_po_sh])