MOBILE-1928 ws: Save "notingroup" errors to the cache

scripts/langindex.json

@@ -1551,6 +1551,7 @@
   "core.noresults": "moodle",
   "core.notapplicable": "local_moodlemobileapp",
   "core.notice": "moodle",
+  "core.notingroup": "moodle",
   "core.notsent": "local_moodlemobileapp",
   "core.now": "moodle",
   "core.numwords": "moodle",

src/assets/lang/en.json

@@ -1550,6 +1550,7 @@
     "core.noresults": "No results",
     "core.notapplicable": "n/a",
     "core.notice": "Notice",
+    "core.notingroup": "Sorry, but you need to be part of a group to see this page.",
     "core.notsent": "Not sent",
     "core.now": "now",
     "core.numwords": "{{$a}} words",

src/classes/site.ts

@@ -632,10 +632,13 @@ export class CoreSite {
                     error.message = this.translate.instant('core.unicodenotsupported');
 
                     return Promise.reject(error);
-                } else if (error.exception === 'required_capability_exception' || error.errorcode === 'nopermission') {
+                } else if (error.exception === 'required_capability_exception' || error.errorcode === 'nopermission' ||
+                        error.errorcode === 'notingroup') {
+                    // Translate error messages with missing strings.
                     if (error.message === 'error/nopermission') {
-                        // This error message is returned by some web services but the string does not exist.
                         error.message = this.translate.instant('core.nopermissionerror');
+                    } else if (error.message === 'error/notingroup') {
+                        error.message = this.translate.instant('core.notingroup');
                     }
 
                     // Save the error instead of deleting the cache entry so the same content is displayed in offline.

src/lang/en.json

@@ -170,6 +170,7 @@
     "noresults": "No results",
     "notapplicable": "n/a",
     "notice": "Notice",
+    "notingroup": "Sorry, but you need to be part of a group to see this page.",
     "notsent": "Not sent",
     "now": "now",
     "numwords": "{{$a}} words",