fix: translation strings (DHIS2-10630)

[KaiVandivier]

Relates to https://jira.dhis2.org/browse/DHIS2-10630 and https://jira.dhis2.org/browse/DHIS2-10664, I believe

Adds translation strings for page headers and 'no apps installed' messages

Controversial: adds legacy i18n to translate '** search **' in the search bar from d2-ui Sidebar (see the second commit). If this one string isn't worth the legacy i18n, especially since Médi is working on the overhaul of this app, I can remove it :)

[HendrikThePendric]

Since this app is still relying on, and has a working implementation of, the legacy i18n system, I think we should make sure these strings are fixed too. So I don't think anything needs to be removed from this PR.

I do think that we may have missed a few strings, for example this seems to result in hardcoded strings:

app-management-app/src/actions.js

Lines 11 to 24 in 67bd72c

	const actions = {
	// App management actions
	installApp: Action.create('Install App'),
	uninstallApp: Action.create('Uninstall App'),
	refreshApps: Action.create('Refresh Apps'),
	appInstalled: Action.create('An app was installed'),
	// App store actions
	loadAppHub: Action.create('Load DHIS2 App Hub'),
	installAppVersion: Action.create('Install App Version from DHIS2 App Hub'),
	// Snackbar
	showSnackbarMessage: Action.create('Show Snackbar message'),
	}

I know it is possible to apply i18n to these Actions. At first glance it seems you could wrap the action name in i18n.t(), like so:

 installApp: Action.create(i18n.t('Install App')),

If this is not providing the expected results, I think you could check either the user-app or the maintenance app to see how they've implemented things.

And quite likely this is ending up as hardcoded text in the UI too:

app-management-app/src/components/SelfUpdateNoticeBox.component.js

Line 11 in 67bd72c

const appManagementAppName = 'App Management'

I'm not sure we want to translate the app-name, but if we do, this needs to be wrapped in a call to i18n.t()

[KaiVandivier]

Ah thanks @HendrikThePendric, I wasn't aware of those :) I'll fix those up too

[KaiVandivier]

Added translations for those actions.

It looks like 'appManagementAppName' is used to find the app on the app hub, and is never displayed, so it doesn't need a translation 👍

app-management-app/src/components/SelfUpdateNoticeBox.component.js

Lines 37 to 41 in 67bd72c

	const appManagementApp = appHub.apps.find(
	app =>
	app.developer.organisation === appManagementAppOrg &&
	app.name === appManagementAppName
	)

[dhis2-bot]

🎉 This PR is included in version 28.2.6 🎉

The release is available on GitHub release

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