* Uplift translations.

* revert styles uplift

Co-authored-by: Jeff Boek <jeff@jeffboek.com>

Stricter synchronization by always using the same "loadedSearchEngines"
variable.
With "loadedSearchEngines" calling "refreshAsync()" we also get the fallback
engines to contain reddit and youtube (which are programatically added) and
also now we properly remember and display the engines added by user.

We have two search engine types:
- one based on MLS reported region,
- one based only on Locale.

There are multiple steps involved in returning the default search engine for
example and though at each step we could verify if a certain operation is
completed we are still exposed to concurrency issues.
Simplest and most effective way to make sure the MLS engines do not mix with
Locale based engines is to use the same type of engines for the entire duration
of the app. At the next cold start we'll verify again which engines to use.

Using the Locale based engines (fallbacks) is expected to only happen once, at
the first run of the application after being installed.

That's amazing! I've got the same combination on my luggage.

* Revert "For #9946: Update FennecBeta branding (#10066)" to push to Firefox Beta.

This reverts commit 95f26f1f

.

* No issue: Test remove codecov (#11928)

Co-authored-by: Emily Kager <emilykager@gmail.com>

* For #11991 - Show tab count during onboarding

* Update AC to 48.0.20200627130132 and fix breaking changes

Updated the fonts and colors for several texts throughout the application.

This is functionally equivalent to the code before this patch but should
be slightly more performant in theory because ConstraintLayout is
expensive to inflate.

The elevation and layoutParams set dynamically appeared to have no effect
with the wrapping view but broke the view when used by itself so I had
to remove them. I also updated a few other unnecessary params.

Theoretically this may have some perf benefits but I didn't see anything
outside noise levels after I took the numbers (but I didn't try very
hard).

* for #11830 added new metric for collecting startup method

move all source startup telemetry into its own logic and added an UNKOWN state

* switched back to onNewIntent solution

* renamed the metric

Increasing duration removed second "light" flicker