Multitude of issues addressed and features added.

[msalamat]

This pull-request encompasses all the bugfixes and additions to functionality done by Medhat Elmasry's COMP4976 class during Fall 2019 (Sept-Dec. 2019).

This includes:

• Issue 91: Localization functionality added. French and Spanish can now be selected as the language on the CMS.

• Issue 87: Rich text editors have been introduced in forms on the CMS. This includes spellchecking.

• Issue 82: DB entity relational diagrams added. See comments by @joey-tang.

• Issue 90: Form validation has been introduced on all forms.

• Issue 88: A new uploaded image now properly deletes the replaced one.

• Issue 85: Data seeding has been improved. See comment from @medhatelmasry.

• Issue 89: Logos of social media sites are now able to be added (e.g. the Snapchat icon).

• Issue 84: Migrations folder. See comment by @medhatelmasry.

• Issue 93: Deleting current selected election will not crash application.

[msalamat]

Straggling commit came in. Closing and re-pull-requesting to add a section on localization & its documentation.