diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index a93b116c6fe1f9fcace7e5ec65b62f39d5aec27d..efb30ba471518963f011d679fdf473a14ad42e02 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -247,13 +247,13 @@ class ProjectsController < Projects::ApplicationController
 
     if find_branches
       branches = BranchesFinder.new(@repository, params).execute.take(100).map(&:name)
-      options[s_('RefSwitcher|Branches')] = branches
+      options['Branches'] = branches
     end
 
     if find_tags && @repository.tag_count.nonzero?
       tags = TagsFinder.new(@repository, params).execute.take(100).map(&:name)
 
-      options[s_('RefSwitcher|Tags')] = tags
+      options['Tags'] = tags
     end
 
     # If reference is commit id - we should add it to branch/tag selectbox
diff --git a/changelogs/unreleased/48100-fix-branch-not-shown.yml b/changelogs/unreleased/48100-fix-branch-not-shown.yml
new file mode 100644
index 0000000000000000000000000000000000000000..917c5c23f67535465ff089057af6019337267dc7
--- /dev/null
+++ b/changelogs/unreleased/48100-fix-branch-not-shown.yml
@@ -0,0 +1,6 @@
+---
+title: Fix branches are not shown in Merge Request dropdown when preferred language
+  is not English
+merge_request: 20016
+author: Hiroyuki Sato
+type: fixed
diff --git a/spec/controllers/projects_controller_spec.rb b/spec/controllers/projects_controller_spec.rb
index 705b30f0130be022f00d0e37fbc36f71ab7f5986..90e698925b643830f5e6840cae70583732fff536 100644
--- a/spec/controllers/projects_controller_spec.rb
+++ b/spec/controllers/projects_controller_spec.rb
@@ -597,6 +597,22 @@ describe ProjectsController do
       expect(parsed_body["Tags"]).to include("v1.0.0")
       expect(parsed_body["Commits"]).to include("123456")
     end
+
+    context "when preferred language is Japanese" do
+      before do
+        user.update!(preferred_language: 'ja')
+        sign_in(user)
+      end
+
+      it "gets a list of branches, tags and commits" do
+        get :refs, namespace_id: public_project.namespace, id: public_project, ref: "123456"
+
+        parsed_body = JSON.parse(response.body)
+        expect(parsed_body["Branches"]).to include("master")
+        expect(parsed_body["Tags"]).to include("v1.0.0")
+        expect(parsed_body["Commits"]).to include("123456")
+      end
+    end
   end
 
   describe 'POST #preview_markdown' do