Fix missing language name in "Add to Dictionary" request in HTML mode (#1490634)

CHANGELOG

@@ -11,6 +11,7 @@ CHANGELOG Roundcube Webmail
 - Fix mail view scaling on iOS (#1490551)
 - Fix PHP7 warning "session_start(): Session callback expects true/false return value" (#1490624)
 - Fix XSS issue in SVG images handling (#1490625)
+- Fix missing language name in "Add to Dictionary" request in HTML mode (#1490634)
 
 RELEASE 1.2-beta
 ----------------

program/js/editor.js

@@ -71,6 +71,9 @@ function rcube_text_editor(config, id)
     tinymce.registered_request_token = true;
     tinymce.util.XHR.on('beforeSend', function(e) {
       e.xhr.setRequestHeader('X-Roundcube-Request', rcmail.env.request_token);
+      // Fix missing lang parameter on addToDictionary request (#1490634)
+      if (e.settings && e.settings.data && /^method=addToDictionary/.test(e.settings.data) && !/&lang=/.test(e.settings.data))
+        e.settings.data += '&lang=' + ref.editor.plugins.spellchecker.getLanguage();
     });
   }