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This change adds the rest of the strings of the feedback form we'll be using. These strings are copied from the current feedback form; we opt to create new strings in case they're modified in the future, as to not disrupt the current feedback flow.

The remaining missing strings (i.e. for file upload) correspond to components that are not planned for the redesign.

No additional styling work has been done; this will be done when the feedback form is also migrated to a dialog.

BUG=615535
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2163753003
Cr-Commit-Position: refs/heads/master@{#407636}