Alphabetical sorting doesn't work for non-ASCII languages. Missing locale setting.

[SmallhillCZ]

Describe the bug
Alphabetical sorting doesn't work for languages with special characters or according to locale. Non-ASCII characters will sort at the end of the list.

To Reproduce
Steps to reproduce the behavior:

1. Add a user with name starting with non-ASCII character, e.g. Č
2. Set contributorsSortAlphabetically to true
3. Open README.md
4. See user starting with Č at the end of the list instead in correct alphabetical order (which is for my locale after C)

Expected behavior
Users will be sorted correctly using specified locale.