Delete the old bootstrap.css and replace by the new 3.2 bootstrap.css
Replace the old glyphicons files by the new ones
Delete bootstrap-responsive.css which will be useless
Rename the folder img in fonts at url modoboa/static
Change html tags in the top navbar and footer navbar
Change html tags in the core of the page
Subsitution of "icon" by "glyphicon" in file admin_tags.py
Add many css rules
Add a bottom margin to the form and change some html tags refering to forms
Substitute "control-group" with "form-group"
Subsititute icon with glyphicon
Change html tags in order to update the "modal frame" with new bootstrap.js version
Update the new 3.2 version of bootstrap.js
Substitute some old html classes with new ones
Rewrite some codes that I mistakenly deleted in admin_tags.py
Change html tags and css rules related to the left side bar in "Statics" page
Subsitute "icon" with "glyphicon"
Turn footer into a collapse button when screen is smaller than 750px
Fix a bug due to updating of bootstrap 3.2  -  Subsitute "show" with "show.bs.modal"
Subsitute hide with hide.bs.modal