Fix several login template translation issues

"permission" has no plural. Explicitly mention the thing were you don't
have access. It's not really translatable (to German at least)
otherwise. Lastly, the "home page" needs to be inside the translatable
string as it's location in the sentence doesn't have to be at the end.

Change-Id: I8e632ab511b8061c0d1a5b58245e03ce9cb87d5e
Merge "Fix several login template translation issues"