diff --git a/packages/debug/src/browser/console/debug-console-items.tsx b/packages/debug/src/browser/console/debug-console-items.tsx
index ff21c14ff00e9..79fc0dd20398f 100644
--- a/packages/debug/src/browser/console/debug-console-items.tsx
+++ b/packages/debug/src/browser/console/debug-console-items.tsx
@@ -21,6 +21,7 @@ import { ConsoleItem, CompositeConsoleItem } from '@theia/console/lib/browser/co
 import { DebugSession } from '../debug-session';
 import { Severity } from '@theia/core/lib/common/severity';
 import * as monaco from '@theia/monaco-editor-core';
+import { nls } from '@theia/core';
 
 export type DebugSessionProvider = () => DebugSession | undefined;
 
@@ -237,7 +238,7 @@ export class DebugVariable extends ExpressionContainer {
             return;
         }
         const input = new SingleTextInputDialog({
-            title: `Set ${this.name} Value`,
+            title: nls.localize('theia/debug/debugVariableInput', 'Set {0} Value', this.name),
             initialValue: this.value
         });
         const newValue = await input.open();
diff --git a/packages/debug/src/browser/view/debug-watch-expression.tsx b/packages/debug/src/browser/view/debug-watch-expression.tsx
index ab21689aae14a..c826613e0e869 100644
--- a/packages/debug/src/browser/view/debug-watch-expression.tsx
+++ b/packages/debug/src/browser/view/debug-watch-expression.tsx
@@ -62,7 +62,7 @@ export class DebugWatchExpression extends ExpressionItem {
 
     async open(): Promise<void> {
         const input = new SingleTextInputDialog({
-            title: 'Edit Watch Expression',
+            title: nls.localizeByDefault('Edit Expression'),
             initialValue: this.expression
         });
         const newValue = await input.open();
diff --git a/packages/filesystem/src/browser/file-tree/file-tree-model.ts b/packages/filesystem/src/browser/file-tree/file-tree-model.ts
index 108aaa9be260f..69a21f2644b45 100644
--- a/packages/filesystem/src/browser/file-tree/file-tree-model.ts
+++ b/packages/filesystem/src/browser/file-tree/file-tree-model.ts
@@ -16,7 +16,7 @@
 
 import { injectable, inject, postConstruct } from '@theia/core/shared/inversify';
 import URI from '@theia/core/lib/common/uri';
-import { CompositeTreeNode, TreeNode, ConfirmDialog, CompressedTreeModel } from '@theia/core/lib/browser';
+import { CompositeTreeNode, TreeNode, ConfirmDialog, CompressedTreeModel, Dialog } from '@theia/core/lib/browser';
 import { FileStatNode, DirNode, FileNode } from './file-tree';
 import { LocationService } from '../location';
 import { LabelProvider } from '@theia/core/lib/browser/label-provider';
@@ -25,6 +25,7 @@ import { FileOperationError, FileOperationResult, FileChangesEvent, FileChangeTy
 import { MessageService } from '@theia/core/lib/common/message-service';
 import { EnvVariablesServer } from '@theia/core/lib/common/env-variables';
 import { FileSystemUtils } from '../../common';
+import { nls } from '@theia/core';
 
 @injectable()
 export class FileTreeModel extends CompressedTreeModel implements LocationService {
@@ -200,10 +201,10 @@ export class FileTreeModel extends CompressedTreeModel implements LocationServic
 
     protected async shouldReplace(fileName: string): Promise<boolean> {
         const dialog = new ConfirmDialog({
-            title: 'Replace file',
-            msg: `File '${fileName}' already exists in the destination folder. Do you want to replace it?`,
-            ok: 'Yes',
-            cancel: 'No'
+            title: nls.localize('theia/filesystem/replaceTitle', 'Replace File'),
+            msg: nls.localizeByDefault('{0} already exists. Are you sure you want to overwrite it?', fileName),
+            ok: Dialog.YES,
+            cancel: Dialog.NO
         });
         return !!await dialog.open();
     }
diff --git a/packages/git/src/browser/git-scm-provider.ts b/packages/git/src/browser/git-scm-provider.ts
index ef18a95022d0b..86836561e7a3c 100644
--- a/packages/git/src/browser/git-scm-provider.ts
+++ b/packages/git/src/browser/git-scm-provider.ts
@@ -415,14 +415,14 @@ export class GitScmProvider implements ScmProvider {
             fileText = `${paths.length} files`;
         }
         return new ConfirmDialog({
-            title: 'Discard changes',
+            title: nls.localize('vscode.git/package/command.clean', 'Discard Changes'),
             msg: nls.localize('vscode.git/commands/confirm discard', 'Do you really want to discard changes in {0}?', fileText)
         }).open();
     }
 
     protected confirmAll(): Promise<boolean | undefined> {
         return new ConfirmDialog({
-            title: 'Discard All Changes',
+            title: nls.localize('vscode.git/package/command.cleanAll', 'Discard All Changes'),
             msg: nls.localize('vscode.git/commands/confirm discard all', 'Do you really want to discard all changes?')
         }).open();
     }
diff --git a/packages/plugin-ext/src/main/browser/commands.ts b/packages/plugin-ext/src/main/browser/commands.ts
index 41b76340e8b8a..601484cf5c6a3 100644
--- a/packages/plugin-ext/src/main/browser/commands.ts
+++ b/packages/plugin-ext/src/main/browser/commands.ts
@@ -71,7 +71,7 @@ class OpenNewTabDialog extends AbstractDialog<string> {
 
     constructor(windowService: WindowService) {
         super({
-            title: 'Your browser prevented opening of a new tab'
+            title: nls.localize('theia/plugin/blockNewTab', 'Your browser prevented opening of a new tab')
         });
         this.windowService = windowService;
 
diff --git a/packages/plugin-ext/src/main/browser/dialogs-main.ts b/packages/plugin-ext/src/main/browser/dialogs-main.ts
index 4519f3f8677ff..501bd7618a9a8 100644
--- a/packages/plugin-ext/src/main/browser/dialogs-main.ts
+++ b/packages/plugin-ext/src/main/browser/dialogs-main.ts
@@ -24,6 +24,7 @@ import { FileUploadService } from '@theia/filesystem/lib/browser/file-upload-ser
 import { FileService } from '@theia/filesystem/lib/browser/file-service';
 import { FileStat } from '@theia/filesystem/lib/common/files';
 import { EnvVariablesServer } from '@theia/core/lib/common/env-variables';
+import { nls } from '@theia/core';
 
 export class DialogsMainImpl implements DialogsMain {
 
@@ -146,7 +147,7 @@ export class DialogsMainImpl implements DialogsMain {
         try {
             // Create save file dialog props
             const dialogProps = {
-                title: options.title ?? 'Save',
+                title: options.title ?? nls.localizeByDefault('Save'),
                 saveLabel: options.saveLabel,
                 filters: options.filters,
                 inputValue: fileNameValue