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/featuremgmt/registry.go

@@ -1818,6 +1818,13 @@ var (
 			HideFromDocs:      true,
 			Expression:        "true", // enabled by default
 		},
+		{
+			Name:         "localizationForPlugins",
+			Description:  "Enables localization for plugins",
+			Stage:        FeatureStageExperimental,
+			Owner:        grafanaPluginsPlatformSquad,
+			FrontendOnly: false,
+		},
 	}
 )
 

pkg/services/featuremgmt/toggles_gen.csv

@@ -239,3 +239,4 @@ alertingMigrationUI,experimental,@grafana/alerting-squad,false,false,true
 unifiedStorageHistoryPruner,experimental,@grafana/search-and-storage,false,false,false
 unifiedStorageGrpcConnectionPool,experimental,@grafana/search-and-storage,false,false,false
 alertingRuleRecoverDeleted,GA,@grafana/alerting-squad,false,false,true
+localizationForPlugins,experimental,@grafana/plugins-platform-backend,false,false,false

pkg/services/featuremgmt/toggles_gen.go

@@ -966,4 +966,8 @@ const (
 	// FlagAlertingRuleRecoverDeleted
 	// Enables the UI functionality to recover and view deleted alert rules
 	FlagAlertingRuleRecoverDeleted = "alertingRuleRecoverDeleted"
+
+	// FlagLocalizationForPlugins
+	// Enables localization for plugins
+	FlagLocalizationForPlugins = "localizationForPlugins"
 )

pkg/services/featuremgmt/toggles_gen.json

@@ -2469,6 +2469,18 @@
         "frontend": true
       }
     },
+    {
+      "metadata": {
+        "name": "localizationForPlugins",
+        "resourceVersion": "1742561476144",
+        "creationTimestamp": "2025-03-21T12:51:16Z"
+      },
+      "spec": {
+        "description": "Enables localization for plugins",
+        "stage": "experimental",
+        "codeowner": "@grafana/plugins-platform-backend"
+      }
+    },
     {
       "metadata": {
         "name": "logQLScope",