Add support for bringing window to foreground

after activation from URL or html file
Allow to hide menu bar
Add error checks for bookmarks parser
Delete menu bar when not needed, references #502
Add shortcut to toggle menu bar, fixes #502
Allow to copy text from console
Remove unwanted STX character during bookmarks import

from Opera
Save correct session when there is no tab, references #486
Update translations from Transifex
Limit maximum amount of console messages to 1000