Update TvdbApi.java

(Previous) Line 68: String requestUrl = SERIES_SEARCH + query; 

(At present) Line 68: String requestUrl = SERIES_SEARCH + query + "&language=" + mLanguage; 

I changed this line of code, because HTTP requests have the following format:

http://www.thetvdb.com/api/GetSeries.php?seriesname=<query>&language=<language> 

The default language is English, then '&language=<language>' is completely irrelevant for the search in English, but for research in other languages ​​is essential to obtain a correct result in the correct languages.