Change markup for headlines in titlebar
Change font-family for input field in share tab

to Droid Sans Mono
Fix font-weights according to latest design doc v1.012

https://trello.com/c/G7dbrG8k
Mobile version for progress elements

according to latest design doc v1.012
Set cursor behavior to 'text' for read-only link input

The episode url can de copied in the download tab, which is indicated
as behavior ‘text’ for the user.
Text elements will scale up depending on screen width

up from an minimum screen-width of 1200px.
Minor fixes in variables and cleanup
Merge pull request #214 from podlove/responsive-typography

Responsive typography and adaption of design doc v1.012