Remove surplus %20 and + from links to twitter and email

Description

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    1. Description

The course about page contains a link to Twitter, Facebook and Email in the sidebar on the right. These links lead to broken messages on Twitter and the email. For example, using `tutor`'s demo environment:

https://demo.openedx.overhang.io/courses/course-v1:edX+DemoX+Demo_Course/about

If you click on the Twitter link on the right:

![image](https://user-images.githubusercontent.com/832723/106925517-72514b00-6710-11eb-9523-22a36e5bf5bb.png)

And if you click on the email button:

![image](https://user-images.githubusercontent.com/832723/106925689-9a40ae80-6710-11eb-971c-db69d806b23e.png)

This bug impacts everybody that uses the default theme, or a theme based off it (like the [indigo theme](github.com/overhangio/indigo).

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    1. Supporting information

I initially raised this problem in the [indigo repository](https://github.com/overhangio/indigo/issues/11)

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    1. Testing instructions

To test this change, make sure your edX uses the default theme. Go to any course's about page and click the twitter icon. You should have no `` signs in the twitter message. Now click the Email icon. You should have no `` signs in the email icon.

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    1. Deadline

None

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    1. Other information

No other information I can think of

Done

Assignee

Kyle McCormick

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Maarten de Waard

Repo

edx/edx-platform

Customer

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 &amp; 2)

None

Platform Map Area (Levels 3 &amp; 4)

None

Blended Hour Utilization Percentage

None

edX Theme

None

edX Squad

None

Github Lines Added

6

Github Lines Deleted

5

Priority

Unset