Localisation updates from https://translatewiki.net.

Change-Id: Ifa25e83b5f62c31a20f6c001aed1f59380c336d8
remove outdated README

Nothing in here was true any more.  We could use a new README, and
it should link to the full documentation on mediawiki.org.

Change-Id: Ieaadb53d1034481f03997f3dde39b715eaedfabc
Localisation updates from https://translatewiki.net.

Change-Id: I530f0e348fe48363f23a85e612078d16731d67c3
Localisation updates from https://translatewiki.net.

Change-Id: I48728104cdccec20a5dac361ddfc01c012b857ff
Localisation updates from https://translatewiki.net.

Change-Id: I353288ee831b2e11b4bc347db27f7099e6e86291