Introduce I18n to Hacktoberfest

[ChaelCodes]

Description

starts #444

• I added the i18n gem
• application controller will pull locales off the URL and render actions with the locale
  • the default is still :en
  • the locale is sticky and will persist as the user navigates the site
  • the locale param is added as soon as a user clicks a link
  • This caused 2 specs to be updated to include the default locale
• The closing homepage has had all static text removed and moved to en.yml
• keys that are referenced in templates and do not exist for the locale config will error in development

One of the decisions I made was to pass locale via params - and to include the current locale in the default URL params. This could potentially set up a user expectation that they could modify the locale and see a translated version of the page, which is not fully implemented. I wonder if it'd be better to add that change once the site has been fully internationalized, and a few translations added.

Test process

• When Hacktoberfest is in a closing state, go to /
• There should be no translation errors, missing keys, or missing text
• Click any link within the hacktoberfest site
• ?locale=en is added to the URL
• Click any link within the hacktoberfest site
• ?locale=en stays on the URL
• Go to ?locale=es
• This will tell you that es is not a valid locale
• If you make an es.yml file
• It will complain about the first key on the page that is missing

Requirements to merge

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[MattIPv4]

Gonna label this as accepted so that it counts, just in case we don't get around to reviewing it in time. Tyvm for the PR!