i18n: wires up translations for plugins (#102853)

* i18n: consolidate i18n types & runtime services

* Chore: updates after PR feedback

* Chore: updates after feedback

* Chore: updates after feedback

* Chore: adds feature toggle

* Chore: adds locale to backend

* Chore: adds locales to i18n instance

* Chore: fix missing path in CODEOWNERS

* Chore: fix go lint issues

* Chore: fix missing path in CODEOWNERS

* Chore: updates after PR feedback

* Trigger build

* Chore: updates after PR feedback

* Chore: use resolved language for lookup

* Chore: updates after PR feedback

* Update pkg/plugins/plugins.go

Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>

* Chore: updates after PR feedback

* Chore: updates after PR feedback

---------

Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>

pkg/services/pluginsintegration/pluginconfig/config.go

@@ -34,6 +34,7 @@ func ProvidePluginManagementConfig(cfg *setting.Cfg, settingProvider setting.Pro
 			SkipHostEnvVarsEnabled:      features.IsEnabledGlobally(featuremgmt.FlagPluginsSkipHostEnvVars),
 			SriChecksEnabled:            features.IsEnabledGlobally(featuremgmt.FlagPluginsSriChecks),
 			PluginsCDNSyncLoaderEnabled: features.IsEnabledGlobally(featuremgmt.FlagPluginsCDNSyncLoader),
+			LocalizationForPlugins:      features.IsEnabledGlobally(featuremgmt.FlagLocalizationForPlugins),
 		},
 		cfg.AngularSupportEnabled,
 		cfg.GrafanaComAPIURL,