How to highlight language abilities in cover letter for a scientific research position? I'm applying for a scientific research position at a Welsh university and one of the desirable skills is to demonstrate an understanding of the bilingual nature of the University. 

As I am fluent in Welsh, I would like to add a sentence to my cover letter stating that I am a bilingual. I would like to write something that makes them feel that it is important to have someone that can speak Welsh and that this would benefit the university. 

Can anyone suggest an appropriate sentence to include?
To address your specific question, I would propose the following sentence for your letter (or something similar to your liking) to highlight your language skills. I would position it toward the bottom, in the concluding paragraph:


  I also believe that my fluency in Welsh will contribute to my ability
  to effectively support the university's bilingual nature.


(alternative wording): 


  ...the university's mission of bilingual service.


I would not worry about providing any additional evidence of Welsh proficiency (as a letter written in the language) as you only want to submit the exact documents required in the application, nothing more. If there will be any need to ascertain your language ability, it can be easily done in a quick chat as part of your interview process or by phone.

Good luck!