Fix password screen for public shares

 * Works in IE8, 9, 10, Firefox 24 and Chromium 30
 * Credits to Julian Müller @Julian1998 

cc @DeepDiver1975 @jancborchardt @Kondou-ger 

WIthout a IE specific line of CSS :cool: :shit: \m/

@Julian1998 Thanks for your preparing work! Keep developing - it's awesome ;)