Use bootstrap for the mobile version as well

Removing jquerymobile since the standard bootstrap classes work very
well on small devices and is now used on the 'desktop' version as well.
Now many custom mobile templates can be removed (but not all, since
some of the more app-like behaviour still requires a different approach
for desktops and phones)
Remove the jquerymobile libraries
Further work on the mobile templates for manager app
Work on some mobile pages in the exercise app
Delete and fix more mobile templates
Fix tests
Move the nutrition plan page to boostrap
Use an off canvas menu in the mobile version
Replace 'on page init' with document ready calls

The on page init was used by jquerymobile and can be replaced by usual on
document ready
Reestablish original order of buttons in index page
Some improvements to the offcanvas menu
Fix problem with save button on narrow devices
Move the add set form to the bootstrap design

Also, add an additional drop down with the categories, allowing the
user to filter the exercises, having all of them in a very long drop
down can be somewhat overwhelming and makes finding one specific one
difficult
Move the exercise overview to the boostrap classes
Make width of weight log chart depending on current width
Remove unused tinymce calls

The tinymce plugin is only used directly on the exercise edit page and
nowhere else.
Translate equipment names in exercise overview
Cleanup unused styles
Use 'text-muted' instead of class 'dimmed'
Remove unused class for the list groups