One big fat messy commit

Here is an "as exhausting as I can" list of things that have been done here:
- Improved a lot views and templates management
- Added a lot of minor modules (views buttons, save button, etc...)
- Translated a lot of things as well
- Started coding the Explore view
- Plugged sigma to display uploaded graphs
- Plus some useless merge with an halfly done feature on another computer 'O_o

A good time to start writing clean commits in that project...