Merge pull request #128336 from petercollingridge/division

Fix divider hint
Improve hint counts
Fix how hints are counted

close #218336
fix #126549; fix #128535
Mark string for translation

Test Plan: none

Auditors: peter
i18n lint

Apparently we can't have $._() inside vars unless we're defining the var so this is what we do.

Test Plan: make lint in khan-exercises

Auditors: james
remove debug code

and adding missing semicolon
may related to #129200
Bug fix for GH-129388. Fix incorrect hint
Fix GH-129394 - Fix instructions text for parallel
removed some unused code
revert (commit of wrong file/removed used code)
Merge pull request #129440 from richard-to/bugfix129388

Bug fix for GH-129388. Fix incorrect hint
Merge pull request #129448 from richard-to/bugfix129394

Fix GH-129394 - Fix instructions text for parallel
Merge pull request #129598 from mauk81/cleanup

removed some unused code
Merge pull request #129256 from mauk81/patch-2

remove debug code
Change equivalent to equal
Merge pull request #130898 from petercollingridge/parallelperp

Change word "equivalent" to "equal"

Test Plan: none

Auditors: eater
Add knumber and equality to kmath

Summary:
Adds
k*.equal
kvector.colinear
kvector.negate
knumber.equal
knumber.sign

Test Plan: New unit tests

Reviewers: alex

Reviewed By: alex

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D5443