well I tried with your string and it didn't happen for me, and when I checked with file it was ok... I would guess there is a problem with default encoding in text mate

 $ file ~/Desktop/test1.txt 
/Users/gplayer/Desktop/test1.txt: UTF-8 Unicode text, with no line terminators
 $ file ~/Desktop/test1.txt 
/Users/gplayer/Desktop/test1.txt: UTF-8 Unicode text

On Apr 3, 2018, at 1:22 PM, feek <feekdiv@gmail.com> wrote:

some text with some special characters: é ü à