Add translations for ActiveRecord models

[mgrachev]

Hi. Added translation support for ActiveRecord models in the sidebar and on the index page (header).

File locale must be of such content:

en:
  activerecord:
    models:
      bet: Rates

[graysonwright]

Hey, @mgrachev! Sorry I haven't responded sooner.

Could you add some tests for this? Maybe something like this, in spec/features/sidebar_spec.rb?

it "honors model translations" do
  allow(I18n).to receive(:translate).with("customer").and_return("user")

  visit admin_customers_path

  sidebar = find(".sidebar__list")
  expect(sidebar).to have_link("Users")
  expect(page).to have_header("Users")
end

[graysonwright]

Do we want to pluralize this?

[mgrachev]

No. The user decides how to display the model name through a file locale. In default pluralization.

[graysonwright]

Maybe the pluralization should happen after the human(...) call? That way it would apply even if it didn't use the default.

[mgrachev]

So better not to do. For example, for the Russian language the forced pluralization it looks like this:

# config/locales/ru.yml
ru:
  activerecord:
    models:
      bet: Ставки

[1] pry(main)> Bet.model_name.human(default: 'Bets').pluralize
=> Ставкиs

[houndci-bot]

Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.

[mgrachev]

Added test

[mgrachev]

Please, restart the build on CircleCI

[graysonwright]

@mgrachev The build is failing because of a Nokogiri security vulnerability, which I've fixed in #285. If you rebase on master, the build should pass and I'll be able to merge it in.

Thanks!

[graysonwright]

@mgrachev I've cleaned it up a bit and added more thorough tests in #298. Let's move discussion over there.

Thanks for your work!