diff --git a/packages/core/src/browser/browser-clipboard-service.ts b/packages/core/src/browser/browser-clipboard-service.ts
index 687bac9bf96cf..924309c535d0a 100644
--- a/packages/core/src/browser/browser-clipboard-service.ts
+++ b/packages/core/src/browser/browser-clipboard-service.ts
@@ -19,6 +19,7 @@ import { isFirefox } from './browser';
 import { ClipboardService } from './clipboard-service';
 import { ILogger } from '../common/logger';
 import { MessageService } from '../common/message-service';
+import { nls } from '../common/nls';
 
 export interface NavigatorClipboard {
     readText(): Promise<string>;
@@ -52,16 +53,21 @@ export class BrowserClipboardService implements ClipboardService {
             } catch (e2) {
                 this.logger.error('Failed reading clipboard content.', e2);
                 if (isFirefox) {
-                    this.messageService.warn(`Clipboard API is not available.
-                    It can be enabled by 'dom.events.testing.asyncClipboard' preference on 'about:config' page. Then reload Theia.
-                    Note, it will allow FireFox getting full access to the system clipboard.`);
+                    this.messageService.warn(nls.localize(
+                        'theia/navigator/clipboardWarnFirefox',
+                        // eslint-disable-next-line max-len
+                        "Clipboard API is not available. It can be enabled by '{0}' preference on '{1}' page. Then reload Theia. Note, it will allow FireFox getting full access to the system clipboard.", 'dom.events.testing.asyncClipboard', 'about:config'
+                    ));
                 }
                 return '';
             }
         }
         if (permission.state === 'denied') {
             // most likely, the user intentionally denied the access
-            this.messageService.warn("Access to the clipboard is denied. Check your browser's permission.");
+            this.messageService.warn(nls.localize(
+                'theia/navigator/clipboardWarn',
+                "Access to the clipboard is denied. Check your browser's permission."
+            ));
             return '';
         }
         return this.getClipboardAPI().readText();
@@ -80,16 +86,21 @@ export class BrowserClipboardService implements ClipboardService {
             } catch (e2) {
                 this.logger.error('Failed writing to the clipboard.', e2);
                 if (isFirefox) {
-                    this.messageService.warn(`Clipboard API is not available.
-                    It can be enabled by 'dom.events.testing.asyncClipboard' preference on 'about:config' page. Then reload Theia.
-                    Note, it will allow FireFox getting full access to the system clipboard.`);
+                    this.messageService.warn(nls.localize(
+                        'theia/core/navigator/clipboardWarnFirefox',
+                        // eslint-disable-next-line max-len
+                        "Clipboard API is not available. It can be enabled by '{0}' preference on '{1}' page. Then reload Theia. Note, it will allow FireFox getting full access to the system clipboard.", 'dom.events.testing.asyncClipboard', 'about:config'
+                    ));
                 }
                 return;
             }
         }
         if (permission.state === 'denied') {
             // most likely, the user intentionally denied the access
-            this.messageService.warn("Access to the clipboard is denied. Check your browser's permission.");
+            this.messageService.warn(nls.localize(
+                'theia/core/navigator/clipboardWarn',
+                "Access to the clipboard is denied. Check your browser's permission."
+            ));
             return;
         }
         return this.getClipboardAPI().writeText(value);
diff --git a/packages/git/src/browser/git-scm-provider.ts b/packages/git/src/browser/git-scm-provider.ts
index 9fa021b3f12d8..42ca2838536e9 100644
--- a/packages/git/src/browser/git-scm-provider.ts
+++ b/packages/git/src/browser/git-scm-provider.ts
@@ -241,13 +241,21 @@ export class GitScmProvider implements ScmProvider {
                 return DiffUris.encode(
                     fromFileUri.withScheme(GIT_RESOURCE_SCHEME).withQuery('HEAD'),
                     changeUri.withScheme(GIT_RESOURCE_SCHEME),
-                    this.labelProvider.getName(changeUri) + ' (Index)');
+                    nls.localize(
+                        'theia/git/tabTitleIndex',
+                        '{0} (Index)',
+                        this.labelProvider.getName(changeUri)
+                    ));
             }
             if (this.stagedChanges.find(c => c.uri === change.uri)) {
                 return DiffUris.encode(
                     fromFileUri.withScheme(GIT_RESOURCE_SCHEME),
                     changeUri,
-                    this.labelProvider.getName(changeUri) + ' (Working tree)');
+                    nls.localize(
+                        'theia/git/tabTitleWorkingTree',
+                        '{0} (Working tree)',
+                        this.labelProvider.getName(changeUri)
+                    ));
             }
             if (this.mergeChanges.find(c => c.uri === change.uri)) {
                 return changeUri;
@@ -255,7 +263,11 @@ export class GitScmProvider implements ScmProvider {
             return DiffUris.encode(
                 fromFileUri.withScheme(GIT_RESOURCE_SCHEME).withQuery('HEAD'),
                 changeUri,
-                this.labelProvider.getName(changeUri) + ' (Working tree)');
+                nls.localize(
+                    'theia/git/tabTitleWorkingTree',
+                    '{0} (Working tree)',
+                    this.labelProvider.getName(changeUri)
+                ));
         }
         if (change.staged) {
             return changeUri.withScheme(GIT_RESOURCE_SCHEME);
@@ -264,7 +276,11 @@ export class GitScmProvider implements ScmProvider {
             return DiffUris.encode(
                 changeUri.withScheme(GIT_RESOURCE_SCHEME),
                 changeUri,
-                this.labelProvider.getName(changeUri) + ' (Working tree)');
+                nls.localize(
+                    'theia/git/tabTitleWorkingTree',
+                    '{0} (Working tree)',
+                    this.labelProvider.getName(changeUri)
+                ));
         }
         return changeUri;
     }
diff --git a/packages/scm-extra/src/browser/history/scm-history-widget.tsx b/packages/scm-extra/src/browser/history/scm-history-widget.tsx
index 6c548550d6e25..6eb4f110e49cf 100644
--- a/packages/scm-extra/src/browser/history/scm-history-widget.tsx
+++ b/packages/scm-extra/src/browser/history/scm-history-widget.tsx
@@ -307,12 +307,14 @@ export class ScmHistoryWidget extends ScmNavigableListWidget<ScmHistoryListNode>
                     const repo = this.scmService.findRepository(new URI(this.options.uri));
                     const repoName = repo ? `${this.labelProvider.getName(new URI(repo.provider.rootUri))}` : '';
 
-                    const relPathAndRepo = [relPath, repoName].filter(Boolean).join(' in ');
-                    path = ` for ${relPathAndRepo}`;
+                    const relPathAndRepo = [relPath, repoName].filter(Boolean).join(
+                        ` ${nls.localize('theia/git/prepositionIn', 'in')} `
+                    );
+                    path = `${relPathAndRepo}`;
                 }
                 content = <AlertMessage
                     type='WARNING'
-                    header={`There is no history available${path}.`}>
+                    header={nls.localize('theia/git/noHistoryForError', 'There is no history available for {0}', `${path}`)}>
                     {reason}
                 </AlertMessage>;
                 break;