Comment 4 for bug 850787

Re. the decade filters, 80s, 90s, etc... are very internationally recognised terms. For example see:

http://tinyurl.com/8yva4u6
http://www.thaigramophone.com/default.asp?content=wboarddetail&wbid=64&qid=27260
http://wallpaper-photo.ru/ua/preview.php?hd=5428
http://vuoiea.webs.com/

etc...

It might not be the 'correct' way of saying things, but often if you look at the local version of Spotify, LastFM, etc.... these are the terms used.

Re. the "All" translation issues, this is a valid bug but should be reported separately.