This is a new section in the extra keys option that allows to enter
arbitrary strings which are then added to the keyboard.
A new string is needed for the title of the section, Android's icons and
strings are used as much as possible to avoid adding more strings.
Keys are stored in the preferences as a JSON array of strings.
Added Romanian characters to the keyboard layout and changed the positioning
corner for the secondary characters that were conflicting with the
newly-introduced romanian characters
Added Romanian translations
