Best practice for adding a title to a channel overview page
If there's only this one page, I'd probably also use a Global Set instead of a Single Section for this.

Add a Global Set with the handle siteInfo and add a Plain Text field title for your title to it, make sure to mark it as translatable. Then in your template access it via {{ siteInfo.title }}.

The good thing with this approach is that you can allow your client to edit the title (for all locales), without having her edit the template or the static translations file. And! You can later add other fields to it, e.g. for other site metadata (description, open graph, etc.) or to change the site's theme.