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This CL adds all the required strings for video tutorials, which
includes IPH card texts, language names, button names, accessibility
texts, tile texts.

Bug: 1117145
Change-Id: Ibfded7ab1a24339d867e0f59ae24ce51f321325d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419338
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809135}