Fixes for two issues

This contains fixes for two issues.
* The [complaint](https://groups.google.com/d/msg/anki-android/Gj-FYvj0NDQ/gInNwY8dWEAJ) about HTML-like answers for the type answer feature. This cleans up the clean up of the answer. The stored answer already has `&lt;`s &c. for `<`s. Do the same kind of replacement for the typed text.
* Use a color with alpha so that the almost invisible “0” in the deck picker looks better on the pink background of the active deck on a tablet.

P.S.  I am not really sure how multiple fixes should be handled with the current branching model. Maybe one after the other. Or with relase-2.2-NN branches.
As one of the fixes is trivial, doing i two-in-one could work here.

P.P.S. My emacs will keep on removing trailing whitespace and adding `LF`s at file ends.