Remove hardcoded strings from DetailView and ProfileActivity

There were some strings in DetailView which were hardcoded or displayed directly from the data returned by the API and therefore could not be translated:
* dialog buttons (status, progress, rating)
* status text
* media type
* media status

I added functions to get the media type, media status and user status as integers to Anime/Manga class and added string-arrays to strings.xml. The integers returned by these functions are the array indices of the string-arrays so they can be used directly for string mapping (see ```getStringFromResourceArray()``` and following functions in DetailView).

Also replaced hardcoded strings in the dialogs by resource strings.