[Web, Rspamd] Add bad language map, add map to mailcow UI

data/conf/rspamd/custom/bad_languages.map

@@ -0,0 +1 @@
+# Regex! /de/ will also match /de_at/ etc.

data/conf/rspamd/local.d/multimap.conf

@@ -127,3 +127,12 @@ BAD_WORDS_DE {
   regexp = true;
   score = 0.1;
 }
+
+BAD_LANG {
+  type = 'selector';
+  selector = 'languages';
+  map = "${LOCAL_CONFDIR}/custom/bad_languages.map";
+  symbols_set = ["LANG_FILTER"];
+  regexp = true;
+  score = 5.0;
+}

data/web/inc/vars.inc.php

@@ -165,5 +165,5 @@ $RSPAMD_MAPS = array(
   'Recipient Whitelist' => 'global_rcpt_whitelist.map',
   'Fishy TLDS (only fired in combination with bad words)' => 'fishy_tlds.map',
   'Bad Words (only fired in combination with fishy TLDs)' => 'bad_words.map',
-  'Bad Words DE (only fired in combination with fishy TLDs)' => 'bad_words_de.map'
+  'Bad languages' => 'bad_languages.map',
 );