firefox bug not in master please merge

[asn10038]

Not sure who was working on this. Please merge this in to master.

[wzao1515]

I'm not sure how to write this into a script since it requires sudo right. Below are steps to reproduce the bug:

1. sudo apt-get install firefox=59.0.2+build1-0ubuntu1
   If Ubuntu system default language is not German or Chinese:
   1. vim /usr/lib/firefox/distribution/distribution.ini (needs sudo as well)
   2. delete line 10
2. firefox
3. In perference, select language and change it to any other language, and it won't work.

I could write a script for step3, but the difficulty is that this bug requires sudo to install firefox and generate the ini file under /usr/lib/firefox.

[Robin-Y-Ding]

I have made a pull request about my firefox bugs. Please let me know if there is any problem