Remove the term 'syspanel' from docs

Since the refactorization of syspanel occurred at
the very early Folsom days, the docs should reflect this too.

Cherry-picked from I8539b0b8bda2f63366c6de75b1a010f52f07fd0e

Fixes bug 1179873

Change-Id: I890c41048ad2cb9f44a1dacce01c570746ce27db
Updated translations from Transifex

Fixes bug #1175241

This is a grizzly version of commit b7e36244c0
in master branch. To avoid fuzzy strings PO files are directly downloaded
from Transifex instead of cherry-picking from master.
This commit does not override the source language 'en'
to avoid the bug fixed by commit a7505869c4.

Change-Id: I4810c45d15413bdf21b9f68f59096c907bb1e624
Merge "Updated translations from Transifex" into stable/grizzly