Get rid of some 'the the' in comments and hints

Auditors: alex

Test Plan:
lint
Make line chart shorter so it fits better

Who needs 9 and 10, anyway?

Auditors: eater
Replace the protractor with a more better one

Test plan: "grep protractor exercises" to discover angle_types and measuring_angles are the only exercises to use the protractor. Open each of them in local mode, try each problem type, taking all hints.

Auditors: alex
Add Locale info to issue reports
Add lang var to issue sandcastle URLs
Merge pull request #82339 from theinternetftw/add-locale-to-issue-reports

Add Locale info to issue reports
Add a preview url function used by D4239.

Test Plan: see D4239

Reviewers: alpert

Reviewed By: alpert

CC: csilvers

Differential Revision: http://phabricator.khanacademy.org/D4241
Added movable angle construction to interactive.js

Summary:
Drag ray controls points to move rays, optionally snapping to
whole degree angles. Drag vertex to move entire angle.

Test Plan: Verified expected behavior in Perseus widget.

Reviewers: jack, eater

Reviewed By: jack

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D4392
Fix styles for MovableAngle.

math.js is currently loaded after interactive.js, so the standard colors
defined there aren't available when interactive.js is first parsed.

Test Plan:
Tested using the Angle subwidget in Perseus on local webapp and confirmed
that KhanUtil colors load correctly now.

Auditors: jack