Change URL to match language query param

[lpercivalDEV]

Fixes #256

• Take query param and convert to lowercase/no spaces for matching function
• Change URL based on converted query param
• Convert select dropdown options to lowercase and no spaces for matching function
• Compare list of options against converted query param to find a match
• If there's a match:
  • Scroll to issues section
  • select correct language from dropdown option
  • Filter issues based on selected language
• If there's no match, do nothing

Langauages are not being filtered due to being tied to click event - will look at change/refresh code to model the change after.

[lpercivalDEV]

I moved all of my work from language_param_URL.js into language_filter.js since I needed to reference functions in the filter file. The language_param_URL.js file was deleted due to being redundant/obsolete.

This was not asked for - but I felt it was important for UX:

• I added the ability to update the URL if a user clicks a new language from the dropdown and also remove the query from the URL if they click the "remove filter" button.

• URLs can now be copied and pasted into new tabs/windows and the query param will still function - scroll to the issues section and filter based on queried language

[mkcode]

@lpercivalDEV - I need to pair with you to refactor this. In general, there is way more code here than is necessary.

[lpercivalDEV]

Updated PR: #386

This was redone in the query-param branch based off latest master (see Updated PR above). This PR is now obsolete and will be closed.