When the user attempts an introduction, instead of the introduction
message input field, an explanatory text will be shown and the
introduction can not be made until the last one has been finished.

Signed-off-by: goapunk <noobie@goapunks.net>

Show a proper error message when database is too new or too old.

New translations: br, nl, he, sv, cs, ja

Keep checking if we are whitelisted and request it if not