Balance buttons if strings are too long

On the new add blogs screen, the buttons at the bottom would overlap on
some locales (like es/de). Try to reduce their size proportionally to
their lengths.

The solution is not ideal and yields different font sizes for both
buttons, but it's definitely better than overlapping buttons

See: http://cl.ly/image/1A0z2r2c3q2Q
Updated translations (de,it)