don't remove contact instance when we remove last event if a chat is stil opened, but when we close the window. Should fix #4272

 - Many punctuation fixes
 - remove "please" (like in the GNOME project).
	The translation guidelines at
	http://gnome.org.ru/wacko/TranslationPrinciples
	warn against using "пожалуйста" (please)
	in Russian technical texts.
 - change voice/aspect of some verbs
 - Fix a space before bang in a string.
	AFAIK, French is the only language to use " !",
	all other languages use exclamation marks without
	spaces (certainly true for English!).

Replace METH_VARARGS with METH_NOARGS, discard win32 ifdefs (it's no more compiled on win32 anyway).

prevent traceback when connection is lost while waiting for user to accept plain connection or ssl certificate. Fixes #4285

verified and NOT verified is _NOT_ both "Verwende Authentifizierung".
That's just super wrong and leads the user to the false impression of
security.

Do not always force backend removal when performing a delayed remove operation. Some coding standards.