Bug 1813519: Translation issues for forum unsubscribe links

Added translation string for forumlower to lang file (english, de)
In lib.php where email message is made,
changed $user->subscribetype to explicityly
translate it with get_string_from_language func

behatnotneeded

Change-Id: I4551160b153c6a93bb455fa988bdafcd2f3e0606
Signed-off-by: Lisa Seeto <lisaseeto@catalyst.net.nz>

htdocs/interaction/forum/lang/en.utf8/interaction.forum.php

@@ -134,6 +134,7 @@ $string['moderatorsdescription'] = 'Moderators can edit and delete topics and po
 $string['name'] = 'Forum';
 $string['nameplural'] = 'Forums';
 $string['newforum'] = 'New forum';
+$string['forumlower'] = 'forum';
 $string['newforumpostnotificationsubjectline'] = '%s';
 $string['newpost'] = 'New post: ';
 $string['newtopic'] = 'New topic';

htdocs/interaction/forum/lib.php

@@ -1155,7 +1155,7 @@ class ActivityTypeInteractionForumNewPost extends ActivityTypePlugin {
                 $post->textbody,
                 $attachments,
                 get_config('wwwroot') . $this->url,
-                $user->subscribetype,
+                get_string_from_language($user->lang, $user->subscribetype . 'lower', 'interaction.forum'),
                 $unsubscribelink
             );
         }
@@ -1165,7 +1165,7 @@ class ActivityTypeInteractionForumNewPost extends ActivityTypePlugin {
                 $post->groupname,
                 $post->textbody,
                 get_config('wwwroot') . $this->url,
-                $user->subscribetype,
+                get_string_from_language($user->lang, $user->subscribetype . 'lower', 'interaction.forum'),
                 $unsubscribelink
             );
         }
@@ -1188,7 +1188,7 @@ class ActivityTypeInteractionForumNewPost extends ActivityTypePlugin {
                 $attachments,
                 get_config('wwwroot') . $this->url,
                 $unsubscribelink,
-                $user->subscribetype
+                get_string_from_language($user->lang, $user->subscribetype . 'lower', 'interaction.forum')
             );
         }
         else {
@@ -1198,7 +1198,7 @@ class ActivityTypeInteractionForumNewPost extends ActivityTypePlugin {
                 $post->htmlbody,
                 get_config('wwwroot') . $this->url,
                 $unsubscribelink,
-                $user->subscribetype
+                get_string_from_language($user->lang, $user->subscribetype . 'lower', 'interaction.forum')
             );
         }
         return $message;