Currently, there are severlar issues with the karma card, like:
1/ improve karma display
2/ images of the rank and badges are can be changed by user, but
after saving the changes are discarded
Apart from that, in the course navbar, the hard-coded white
text color is given, due to which in some themes the text
becomes invisible. And in the courses cards below navbar,
the course title is not editable.
This commit improves the following points:
1/ Makes the next rank card (on course home page) a bit bigger, adds a
tooltip on the progress bar that shows gained xp out of minimum xp
needed for next rank (ex: "2500/10000 xp") if there is next rank,
and improves the text below rank image that now shows xp to gain for
next rank or if there isn't next rank, simply displays the earned xp.
2/ Makes the images editable (in karma card as well as in the
user profile and in '/profile/ranks_badges' page)
3/ Makes the rank title editable
4/ Removes the hard-coded white text color from the course
navbar and make the course title editable
taskID-2853264
closesodoo/odoo#92871
Signed-off-by: Warnon Aurélien (awa) <awa@odoo.com>