Add tooltips to page header

[annavik]

Fixes #399

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[mihow]

Tooltips, yes!! Are the strings copied from the google doc? I want to update a few of them but I should change them in both places and make sure there isn't existing discussion about a string.

[annavik]

Tooltips, yes!! Are the strings copied from the google doc? I want to update a few of them but I should change them in both places and make sure there isn't existing discussion about a string.

Yes I have copied them! Feel free to update the Google doc and I can sync to this PR if you want :)