Dynamic Gaia view

I still have things to address:

Find a way to detect is a gaia repository is older than an other, because:
If repo 1 = Master and repo2 = 1.4
-> we display strings added to master.

If repo 1 = 1.4 and repo2 = master
-> we display strings deleted from master

Both are useful, but we need to indicate what the results are.