(js) Fix SCAYT automatic language selection

NEWS

@@ -12,6 +12,7 @@ Bug fixes
  - [core] remove attendees that have the same identity as the organizer (#3905)
  - [eas] improved EAS parameters parsing (#4003)
  - [eas] properly handle canceled appointments
+ - [web] fixed SCAYT automatic language selection in HTML editor
 
 2.3.19 (2017-01-09)
 -------------------

UI/WebServerResources/UIxMailEditor.js

@@ -533,7 +533,8 @@ function initMailEditor() {
         CKEDITOR.replace('text',
                          {
                              language : localeCode,
-			     scayt_sLang : localeCode
+                             scayt_disableOptionsStorage : 'lang',
+                             scayt_sLang : scaytLang(localeCode)
                           }
                          );
         CKEDITOR.on('instanceReady', function(event) {

UI/WebServerResources/UIxPreferences.js

@@ -715,7 +715,8 @@ function onMailIdentitySignatureClick(event) {
                                               'BGColor'], ['Source']
                                             ],
                                    language: localeCode,
-                                   scayt_sLang: localeCode });
+                                   scayt_disableOptionsStorage : 'lang',
+                                   scayt_sLang : scaytLang(localeCode) });
             }
         }
         dialog.mailAccount = this.mailAccount;

UI/WebServerResources/generic.js

@@ -2285,6 +2285,22 @@ function _disposeDialog() {
     }
 }
 
+// Pickup the first matching language supported by SCAYT
+// See http://docs.ckeditor.com/#!/guide/dev_howtos_scayt
+function scaytLang(locale) {
+    var i, langs, lang;
+
+    langs = ['en_US', 'en_GB', 'pt_BR', 'da_DK', 'nl_NL', 'en_CA', 'fi_FI', 'fr_FR', 'fr_CA', 'de_DE', 'el_GR', 'it_IT', 'nb_NO', 'pt_PT', 'es_ES', 'sv_SE'];
+    lang = 'en_US';
+    for (i = 0; i < langs.length; i++)
+        if (langs[i].lastIndexOf(locale, 0) == 0) {
+            lang = langs[i];
+            break;
+        }
+
+    return lang;
+}
+
 function readCookie(name) {
     var foundCookie = null;