feat: Hosted login translation API (#10011)

# Which Problems Are Solved

This PR implements https://github.com/zitadel/zitadel/issues/9850

# How the Problems Are Solved

  - New protobuf definition
  - Implementation of retrieval of system translations
- Implementation of retrieval and persistence of organization and
instance level translations

# Additional Context

- Closes #9850

# TODO

- [x] Integration tests for Get and Set hosted login translation
endpoints
- [x] DB migration test
- [x] Command function tests
- [x] Command util functions tests
- [x] Query function test
- [x] Query util functions tests

internal/api/authz/context_mock.go

@@ -1,10 +1,28 @@
 package authz
 
-import "context"
+import (
+	"context"
 
-func NewMockContext(instanceID, orgID, userID string) context.Context {
+	"golang.org/x/text/language"
+)
+
+type MockContextInstanceOpts func(i *instance)
+
+func WithMockDefaultLanguage(lang language.Tag) MockContextInstanceOpts {
+	return func(i *instance) {
+		i.defaultLanguage = lang
+	}
+}
+
+func NewMockContext(instanceID, orgID, userID string, opts ...MockContextInstanceOpts) context.Context {
 	ctx := context.WithValue(context.Background(), dataKey, CtxData{UserID: userID, OrgID: orgID})
-	return context.WithValue(ctx, instanceKey, &instance{id: instanceID})
+
+	i := &instance{id: instanceID}
+	for _, o := range opts {
+		o(i)
+	}
+
+	return context.WithValue(ctx, instanceKey, i)
 }
 
 func NewMockContextWithAgent(instanceID, orgID, userID, agentID string) context.Context {