Extend strings.xml character limits

Per linguist's suggestion, extend character limits of strings. And,
keep app's name "Dynamic System Update" not translated.

Bug: 154345776
Bug: 154345861
Bug: 154345863
Test: None
Change-Id: If57e0e0f301588f60744678f0ec942e8eb8e8a70
Merged-In: If57e0e0f301588f60744678f0ec942e8eb8e8a70
(cherry picked from commit 8f3bdb82)