git has issues with international characters in branch names

["Ax Da" <discussion@xxxxxxx>]

The documentation doesn't seem to be clear about which characters are allowed as branch names.

We have been using umlauts and apostrophes in our branch names, and both are having issues:

- apostrophe:
  git removes the apostrophes from the branch name when creating/pushing a branch.
  In our TFS server repository we're having the same branch name twice: Once with apostrophes,
  and once without. And I don't seem to be able to delete the one without apostrophes.

- umlauts:
  The umlauts are not correctly interpreted when SMB is used. "gemäss" becomes "gem<C3><A4>ss".
  (See images attached.)

Attachment: branch name with umlauts 001.png
Description: PNG image

Attachment: branch name with umlauts 002.png
Description: PNG image