Use the localization package

In dependencies- "vscode-nls": "^2.0.2"
In code:

import * as nls from 'vscode-nls';
const localize = nls.loadMessageBundle();
const login = { title: localize('azure-account.login', "Login") };

Start by locating the dependency manifest and the code that defines the login title. Compare the current login message with the shown vscode-nls dependency and loadMessageBundle usage, then verify that the title is localized and the extension still builds and runs correctly.

Written by the indexing model from the issue text.