[FIX] Fix users.setPreferences endpoint, set language correctly (#12734)

* Fix users.setPreferences endpoint, set language correctly

* Fix tests

packages/rocketchat-api/server/v1/users.js

@@ -422,7 +422,6 @@ RocketChat.API.v1.addRoute('users.setPreferences', { authRequired: true }, {
 				muteFocusedConversations: Match.Optional(Boolean),
 			}),
 		});
-
 		const userId = this.bodyParams.userId ? this.bodyParams.userId : this.userId;
 		const userData = {
 			_id: userId,
@@ -438,13 +437,23 @@ RocketChat.API.v1.addRoute('users.setPreferences', { authRequired: true }, {
 		}
 
 		Meteor.runAsUser(this.userId, () => RocketChat.saveUser(this.userId, userData));
+		const user = RocketChat.models.Users.findOneById(userId, {
+			fields: {
+				'settings.preferences': 1,
+				language: 1,
+			},
+		});
 
 		return RocketChat.API.v1.success({
-			user: RocketChat.models.Users.findOneById(userId, {
-				fields: {
-					'settings.preferences': 1,
+			user: {
+				_id: user._id,
+				settings: {
+					preferences: {
+						...user.settings.preferences,
+						language: user.language,
+					},
 				},
-			}),
+			},
 		});
 	},
 });

packages/rocketchat-lib/server/functions/saveUser.js

@@ -242,11 +242,14 @@ RocketChat.saveUser = function(userId, userData) {
 	if (userData.roles) {
 		updateUser.$set.roles = userData.roles;
 	}
-
 	if (userData.settings) {
 		updateUser.$set.settings = { preferences: userData.settings.preferences };
 	}
 
+	if (userData.language) {
+		updateUser.$set.language = userData.language;
+	}
+
 	if (typeof userData.requirePasswordChange !== 'undefined') {
 		updateUser.$set.requirePasswordChange = userData.requirePasswordChange;
 	}

tests/end-to-end/api/01-users.js

@@ -1004,28 +1004,56 @@ describe('[Users]', function() {
 
 	describe('[/users.setPreferences]', () => {
 		it('should set some preferences by user when execute successfully', (done) => {
-			preferences.userId = credentials['X-User-Id'];
+			const userPreferences = {
+				userId: credentials['X-User-Id'],
+				data: {
+					...preferences.data,
+				},
+			};
 			request.post(api('users.setPreferences'))
 				.set(credentials)
-				.send(preferences)
+				.send(userPreferences)
 				.expect(200)
 				.expect('Content-Type', 'application/json')
 				.expect((res) => {
-					expect(res.body.user.settings.preferences).to.be.eql(preferences.data);
+					expect(Object.keys(res.body.user.settings.preferences)).to.include.members(Object.keys(userPreferences.data));
 					expect(res.body).to.have.property('success', true);
 				})
 				.end(done);
 		});
+		it('should set some preferences and language preference by user when execute successfully', (done) => {
+			const userPreferences = {
+				userId: credentials['X-User-Id'],
+				data: {
+					...preferences.data,
+					language: 'en',
+				},
+			};
+			request.post(api('users.setPreferences'))
+				.set(credentials)
+				.send(userPreferences)
+				.expect(200)
+				.expect('Content-Type', 'application/json')
+				.expect((res) => {
+					expect(res.body).to.have.property('success', true);
+					expect(res.body.user.settings.preferences).to.have.property('language', 'en');
+				})
+				.end(done);
+		});
 	});
 
 	describe('[/users.getPreferences]', () => {
 		it('should return all preferences when execute successfully', (done) => {
+			const userPreferences = {
+				...preferences.data,
+				language: 'en',
+			};
 			request.get(api('users.getPreferences'))
 				.set(credentials)
 				.expect(200)
 				.expect('Content-Type', 'application/json')
 				.expect((res) => {
-					expect(res.body.preferences).to.be.eql(preferences.data);
+					expect(res.body.preferences).to.be.eql(userPreferences);
 					expect(res.body).to.have.property('success', true);
 				})
 				.end(done);