Postprocessing for crowdin: cleanup PO-Revision-Date: from .po files

.ci/Jenkinsfile.crowdin

@@ -38,6 +38,8 @@ timestamps {
             sh "$crowdin_cli download --branch ${upstream_branch}"
           }
         }
+        sh 'find . -name "*.po" -exec msgfilter -i "{}" -o "{}.replacement" .ci/cleanup-po.pl ";"'
+        sh 'find . -name "*.po" -exec mv "{}.replacement" "{}" ";"'
       }
       stage('Push') {
         sh 'git config user.name "ZNC-Jenkins"'

.ci/cleanup-po.pl

@@ -0,0 +1,16 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use v5.10;
+
+local $/;
+my $text = <>;
+
+if ($ENV{MSGFILTER_MSGID}) {
+	print $text;
+} else {
+	for (split(/^/, $text)) {
+		print unless /^PO-Revision-Date:/;
+	}
+}