Organize client folder & refactor NavBar & Fix i18 text

[AdhamAH]

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Please include the issue number the pull request fixes by replacing YOUR-ISSUE-HERE in the text below.

Fixes #709 fixes #719 fixes #715

Summary

1. refactor NavBar.jsx
2. reorganize client folder

Details

Test Plan (required)

Final Checklist

• [x] For CoronaTracker, did you bump the version in package.json?
  • Update the second decimal for a major change
  • Update the third decimal for a minor change
  • Numbers can go past 9, e.g. 1.0.9 => 1.0.10
  • For more info, read about Semantic Versioning
• [x] Did you add any new tests as necessary?
• [x] Is your PR rebased off the most current master?
• [x] Have you squashed all commits? (can be done at merge)
• [x] Did you use yarn not npm? (important!)
• [x] Did you use Material-UI wherever possible?
• [x] Did you run yarn lint on the code?
• [x] Did you run all of your most recent changes locally to make sure everything is working?

[AdhamAH]

Thank you! Yeah I saw the issue you made after I opened #719 😄 It is a close issue but it is different. What I did here not made the changes in #716 but I changed what component the NavBar uses to something more suitable to make the changes to UI and NavBar easier to apply.

[SomeMoosery]

While this all looks good and it should be ready to merge, I'd like to get one more codeowner approval on this before merging in (@acthelemann @pavel-ilin)

Otherwise, i'll just merge it tomorrow though as we should really get this in

[AdhamAH]

No worries at all @SomeMoosery I actually could merge it before I went to sleep but I didn't. I was waiting for the two other PR to merge. It is easier for me to rebase, hopefully 😄