pdf export filename qith quotes fails in chrome

[raycarrick-ed]

Filename for pdf export is derived from plan title. If it has quotes in it, this fails in chrome. This removes the quotes.

[briri]

looks good @raycarrick-ed just a very minor rubocop complaint then go ahead and merge after that

[nicolasfranck]

Is this actually enough as a check? I can imagine that tomorrow other characters will emerge. What if someone adds emoticons?

I think that a filename like plan_<plan_id>_phase_<phase_id>.pdf would be much safer,
and you do not have to worry about future bugs anymore.

e.g. a title like "Relax, Accept & Regulate": Experimental research on the sequence of emotion regulation. after this fix leads to a filename called Relax,_Accept_&_Regulate__Experimental_research_on_the_sequence_of_emotion_regulation..pdf. Not really an improvement ;-)