Only one user is displayed in "Now are browsing this branch" for branches with question type topic

Only current username is displayed in "Now are browsing this branch:" at the bottom of branch with question type topic when 2 different users logged in and browsing the same branch.

Steps to reproduce:

1. login as 2 registered users in to JCommune in different browsers.
2. Create new branch in JCommune and give permitions VIEW_TOPICS and CREATE_QUESTIONS to his group.
3. Go to created branch with user1 and create question type topic.
4. Open created branch with topic by user1 and than by user2.
5. Refresh browser page by user1.

AR: You see in bottom of the branch for user1: "Now are browsing this branch: user1"; for user2: "Now are browsing this branch: user2"  
ER: You see in bottom of the branch for user1 and user2: "Now are browsing this branch: user1, user2";