We were executing SQL queries searching for translations even for
records which were not persisted in the database and therefore had no
translations.
So we're now only looking for translations when the record is persisted.
Note that, when the record isn't persisted, we're using `I18n.translate`
instead of the `t` method. That's because the `t` method would also
perform database queries since we overwrite the `t` method in the
`i18n_translation` initializer.
On tabs with many records, like the proposals tab, requests are now up
to three times faster on production environments.
Tests related to this part of the application were failing sometimes
because requests took longer than `Capybara.default_max_wait_time`.
After these changes, the custom information texts pages load about 30%
faster when running the tests.
This way it's easier to test; changing it will also be easier.
During my experiments I made a mistake which wasn't covered by the test
suite. We're adding a test for this case.
Note we're using `i18n_content` in the component instead of `content`
because there's already a `content` method provided by ViewComponent.
