We do a similar thing with the settings helper, caching settings on a
per-request basis.
Using an instance variable in a helper reduces the amount of times we
need to calculate the cache key during a single request.
Even if Rails caches SQL queries per request, the test suite is faster
with this change, and we get rid of many redundant queries in the logs.
This way we avoid fetching each translation every time it's requested.
This reduces the amount of queries in the development logs and also
makes the test suite faster.
We were already using `find_by` most of the time.
Since there are false positives related to our `find_by_slug_or_id!` and
`find_by_manger_login` methods, which cannot be replaced with `find_by`,
I'm adding it indicating the "refactor" severity.
After creating a translation in spanish, it was also displaying it when selecting
the english locale.
This was due to the code picking the first translation available
With this commit, we are checking for an existing translation in the current locale
and displaying it if it exists
