Feature/oxui 246 as a user i wan to show hide my entered password

Feature checklist

• created mock-ups first
• written tests
• written some documentation (if needed)
• added some metrics events (if useful)
• checked on mobile devices (at least in dev tools)
• tested accessibility (semantically correct markup, source-/tab-order)?
• flown over the uxchecklist
• passed usability test (friendly user test)

Implementation notes

• maybe we should add this also to the main login dialog and not only the password mini view