About the english translation, we indeed miss some of them, sorry for that, I didn't try an english installation recently. I didn't have much time to do it today, but we will add them soon.
But despite the missing translation, your installation seems to have others problems, all wikifab extensions are missing. Have you well add the following line in your file LocalSettings.php ?
after add it, you need to run the script : php maintenance/update.php
to make it work.
It tried to find an other way to install wikiffab, without php script, but I didn't manage to do a simple install yet.
I am sorry it is hard to do on OVH servers. I didn't install it on a standard web hosting. Could you explain what tricks you had to do to make it works ? We know other people who will probably have to do the same soon.