key with ' in it, breaks it

[sebastiaanspeck]

• Laravel Version: 5.7.9
• PHP Version: 7.1.19
• Database Driver & Version: MySQL 5.7.23

Description:

When you have a key in a language-file with a \' in it and run php artisan langman:missing it works okay and you can translate things, but when you run php artisan langman:missing again, it crashes because langman overwrites the key with \' and changes it to '

Steps to reproduce:

1. Add a key to a language-file with \' in it. e.a. 'today's posts'
2. Run php artisan langman:missing (also works with php artisan langman:trans KEY) (note: you also cannot use the 'today's posts' as key)
3. Translate (or press Enter)
4. Run php artisan langman:missing again -> crash and 'today's posts' is changed to 'today's posts'