Danish translations for configurable action on selection of albums and songs

I provided Danish localisation for this, to use when merging to the actionbar branch.

While translating this, I noticed that we already have strings for similar actions in the context menus. I ended using the exact same texts as:

CONTEXTMENU_BROWSE_SONGS
CONTEXTMENU_PLAY_ITEM
CONTEXTMENU_ADD_ITEM
CONTEXTMENU_INSERT_ITEM

Which suggests that we use those for the PlayableItemAction.Type.labelId

Another option is to use server strings (which are available on the actionbar branch). PLAY_NEXT, PLAY_NOW, ADD_TO_END, ?. This seems a bit more risky as we increase the dependency on the server version, and also I don't particularly like those texts.

What do you think?