membership widget styling

Needs to update membership widget style after Bootstrap upgrading.

Change-Id: I34b730ac0f943cb8e341b163c271065246b9b45f
Closes-bug: 1347067
Replace force_unicode with force_text

Django changed the name to force_unicode and it's only available in
python2 as an alias of force_text. The new name is available since
Django 1.4.2

Closes-Bug: #1345642
Change-Id: Ida8c545ceec7c31999f2497d540a0dc5a653d286
Merge "membership widget styling"
Merge "Replace force_unicode with force_text"