Use async call to detect user language in Tabzilla, Bug 1018724
[fix bug 1038125] Privacy archive page is 500 error
Merge pull request #2151 from alexgibson/bug-1038125-privacy-archive-page-500-error

[fix bug 1038125] Privacy archive page is 500 error
Merge pull request #2088 from kyoshino/bug-1018724-tabzilla-userlang

Use async call to detect user language in Tabzilla, Bug 1018724