`l10n.t('foo\'bar')` is being extracted as `foo\'bar` but really it should honor escape characters about vscode-l10n

[connor4312]

There remains a bug here: if the escaped character is anything but the quote style used for the string, then it gets double-escaped, for example l10n.t('hello \" world') results in "hello \\" world" instead of "hello \" world"

[TylerLeonhardt]

Verification:

in an extension.ts file:

import { l10n } from 'vscode';
l10n.t('foo \' bar');

exporting that using:

npx @vscode/l10n-dev export ./extension.ts

should get you a bundle.l10n.json file with:

{
  "foo ' bar": "foo ' bar"
}