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Add missing titlecase for content-setting bubble.

Fixes several missing entries, also removes a couple of instances of
trailing punctuation from titles as well as add "In Title Case: " to a
couple of existing message descriptions.

Bug: chromium:807886
Change-Id: I9a184f0cfd2e27f332a2b118af8663990ed36f65
Reviewed-on: https://chromium-review.googlesource.com/898484Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533900}