Abstract language other than primary language

I have the following question concerning ojs3.3 Website Settings, Languages.
We have chosen German as Primary locale. So it is mandatory, that the abstract of a submission is set in german language field. In our case we have only abstracts in english language, although the content of the submission is in german or another language. The problem is, that if we put the english abstract into the german language field (which is mandatory), the hyphenation in frontend is not correct because the german hyphenation rules are applied for english text. Actual we have changed the template (bootstrap3 - article_details.tpl, added attribute “lang=en-GB”) to solve the problem. Is there another possibility or wordaround to solve it?
Thanks and Regards
C. Decker