Description of problem:

SelectableDropdown is a custom object introduced for Katello which allows the user to select from multiple strings. It currently does not support translation without using hackey translated-strings-as-keys logic which is a bad idea for many reasons.

This fix would modify the items field (or add a new field) to accept a key field and a "display text" field. The SelectableDropdown will render the display text as a translated string, while the page can use the key field for page logic.

SelectableDropdown is currently used in 15 places:

• `/home/vagrant/katello/webpack/components/extensions/HostDetails/Tabs/DebsTab/DebsTab.js` (1)
• `/home/vagrant/katello/webpack/components/extensions/HostDetails/Tabs/ErrataTab/ErrataTab.js` (2)
• `/home/vagrant/katello/webpack/components/extensions/HostDetails/Tabs/ModuleStreamsTab/ModuleStreamsTab.js` (2)
• `/home/vagrant/katello/webpack/components/extensions/HostDetails/Tabs/PackagesTab/PackagesTab.js` (2)
• `/home/vagrant/katello/webpack/components/extensions/HostDetails/Tabs/RepositorySetsTab/RepositorySetsTab.js` (2)
• `/home/vagrant/katello/webpack/scenes/Content/Table/ContentTable.js` (1)
• `/home/vagrant/katello/webpack/scenes/ContentViews/Details/ComponentContentViews/ContentViewComponents.js` (1)
• `/home/vagrant/katello/webpack/scenes/ContentViews/Details/Filters/CVErrataIDFilterContent.js` (1)
• `/home/vagrant/katello/webpack/scenes/ContentViews/Details/Filters/AffectedRepositories/AffectedRepositoryTable.js` (1)
• `/home/vagrant/katello/webpack/scenes/ContentViews/Details/Repositories/ContentViewRepositories.js` (2)

How reproducible:

Always

Is this issue a regression from an earlier version:

No

Steps to Reproduce:

1. Create a user with a different language.

2. Navigate to any page with a SelectableDropdown (see above) and note that none of the options in any dropdowns are translated.

Actual behavior:
No translations are supported in dropdowns without hacks.

Expected behavior:
We should support translations in these dropdowns.

Business Impact / Additional info: