Thanks for your Pull Request.
Unfortunately we can't merge Pull Requests on translation files as those changes would be overwritten when pulling translations from our translation tool.
For future changes please create an account on http://translations.piwik.org and do translation improvements there. Changes done there will be automatically merged to git from time to time.
If you are interested to help more in translations or need assistance for our translation tool, please get in touch with firstname.lastname@example.org
FYI: I've done your small change in our translation tool. It will be merged to git in the coming days.
Ok, I have registered at translation service and see, that this typo is already fixed.
Feel free to improve other translations or to add some missing ones...