Add IMDB and Wikipedia link to series

Wikipedia link just googles serie + wikipedia and goes to first result,
not always accurate, is in most cases. IMDB link takes yuo to the IMDB
page using the provided IMDB_ID, and the button isn't shown when a serie
doesn't have an IMDB ID
Translation support
Merge pull request #246 from Js41637/links

Add IMDB and Wikipedia link to series