Update install dialog strings

Update the strings in the install dialog to match the strings
finalised by UX in go/web-app-installer-strings

Bug: b/331691137
Change-Id: Ie9679679da7b8dd5e9ff78d68e5baeb25382ff68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5418493


Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Louise Brett <loubrett@google.com>
Cr-Commit-Position: refs/heads/main@{#1282205}