Add server translation (#9847)

First proof of concept for server-side translation.

The goal was to translate one metadata item:

<img width="939" alt="Screenshot 2025-01-26 at 08 18 41"
src="https://github.com/user-attachments/assets/e42a3f7f-f5e3-4ee7-9be5-272a2adccb23"
/>

packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.resolver.ts

@@ -1,5 +1,12 @@
 import { UseGuards } from '@nestjs/common';
-import { Args, Mutation, Resolver } from '@nestjs/graphql';
+import {
+  Args,
+  Context,
+  Mutation,
+  Parent,
+  ResolveField,
+  Resolver,
+} from '@nestjs/graphql';
 
 import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
 import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorator';
@@ -22,6 +29,30 @@ export class ObjectMetadataResolver {
     private readonly beforeUpdateOneObject: BeforeUpdateOneObject<UpdateObjectPayload>,
   ) {}
 
+  @ResolveField(() => String, { nullable: true })
+  async labelPlural(
+    @Parent() objectMetadata: ObjectMetadataDTO,
+    @Context() context,
+  ): Promise<string> {
+    return this.objectMetadataService.resolveTranslatableString(
+      objectMetadata,
+      'labelPlural',
+      context.req.headers['x-locale'],
+    );
+  }
+
+  @ResolveField(() => String, { nullable: true })
+  async labelSingular(
+    @Parent() objectMetadata: ObjectMetadataDTO,
+    @Context() context,
+  ): Promise<string> {
+    return this.objectMetadataService.resolveTranslatableString(
+      objectMetadata,
+      'labelSingular',
+      context.req.headers['x-locale'],
+    );
+  }
+
   @Mutation(() => ObjectMetadataDTO)
   async deleteOneObject(
     @Args('input') input: DeleteOneObjectInput,

packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.service.ts

@@ -3,6 +3,7 @@ import { InjectRepository } from '@nestjs/typeorm';
 
 import console from 'console';
 
+import { i18n } from '@lingui/core';
 import { Query, QueryOptions } from '@ptc-org/nestjs-query-core';
 import { TypeOrmQueryService } from '@ptc-org/nestjs-query-typeorm';
 import { isDefined } from 'class-validator';
@@ -14,6 +15,7 @@ import { DataSourceService } from 'src/engine/metadata-modules/data-source/data-
 import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
 import { IndexMetadataService } from 'src/engine/metadata-modules/index-metadata/index-metadata.service';
 import { DeleteOneObjectInput } from 'src/engine/metadata-modules/object-metadata/dtos/delete-object.input';
+import { ObjectMetadataDTO } from 'src/engine/metadata-modules/object-metadata/dtos/object-metadata.dto';
 import { UpdateOneObjectInput } from 'src/engine/metadata-modules/object-metadata/dtos/update-object.input';
 import {
   ObjectMetadataException,
@@ -533,4 +535,18 @@ export class ObjectMetadataService extends TypeOrmQueryService<ObjectMetadataEnt
       );
     }
   };
+
+  async resolveTranslatableString(
+    objectMetadata: ObjectMetadataDTO,
+    labelKey: 'labelPlural' | 'labelSingular',
+    locale: string,
+  ): Promise<string> {
+    if (objectMetadata.isCustom) {
+      return objectMetadata[labelKey];
+    }
+
+    i18n.activate(locale);
+
+    return i18n._(objectMetadata[labelKey]);
+  }
 }