Fix for issue 5137

https://github.com/diaspora/diaspora/issues/5137

Assuming the Dutch locale file is supposed to look similar to this (https://github.com/rmm5t/jquery-timeago/blob/master/locales/jquery.timeago.nl.js), then wordSeparator needs to be a space, not an empty string. Tried it out and there is now a space between the time and ago, e.g. "minuten geleden"