Need to remove leading and trailing spaces in user input in bookmarks settings
Desc: Often user copy server settings from somewhere and paste it in bookmarks settings in Gajim. So this input data can consist of leading or/and trailing spaces and it will be cool to remove them.
For example, we want to add in our bookmarks (Actions->Gropu Chat->Manage Bookmarks) room called 'novosibirsk' on server called 'conference.jabber.ru'.
If we make mistake and paste as server 'conference.jabber.ru ' it will not work.