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The title was previously set to "Feedback" because of the untranslatable
manifest.json. Instead, use a translatable title string.

BUG=chromium:977523
TEST=set IDS_FEEDBACK_REPORT_APP_TITLE to a unique string, deployed to \
     a VM, opened feedback window, verified that: <title> was expected \
     string; mouseover text in system tray was expected string; name   \
     of app in chrome://inspect was expected string


Change-Id: Iecaf57e704c49dbab499de2cd7404cba5cfdb122
Fixed: chromium:977523
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248465Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Miriam Zimmerman <mutexlox@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779901}