Improve "Revision Browser" entry in the editor overflow menu

[maxme]

Currently the menu item to access the "Revision Browser" is "History". It's not clear. Calypso uses a different approach:

Solution: replace "History" by "Revisions (N)" in this menu.

Current Implementation	Future Solution

WPiOS ticket

wordpress-mobile/WordPress-iOS#11994

[stale]

This issue has been marked as stale because:

• It has been inactive for the past year.
• It isn't in a project or a milestone.
• It hasn’t been labeled [Pri] Blocker, [Pri] High, or good first issue.

Please comment with an update if you believe this issue is still valid or if it can be closed. This issue will also be reviewed for validity and priority (cc @designsimply).

[peril-wordpress-mobile]

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