Add language attribute to html start tag

[istarlet]

Fixes #1662 (<=== Add issue number here)

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[istarlet]

@TildaDares , locally I've undone the changes and updated the files without formatting the files. Now I'm stuck on what to do next. Git says "hint: Updates were rejected because the tip of your current branch is behind" When I "pull", it says everything is up to date. Thank you for your help!

[TildaDares]

Hi @istarlet, the top answers on this SO question might help.

[TildaDares]

Hi @istarlet, do you need help with this? Please feel free to ask!

[cesswairimu]

Hello @istarlet , It seems like this was solved in another PR.. Closing this... Feel free to browse other open issues issue. Thanks