As a Wikisource user, I want the "choose format" link in the sidebar to open in a new tab, so I don't lose my place on the Wikisource page.
Background: In the process of migrating the WSExport gadget to the Wikisource extension, we received the following comment in T256392#6753267: "Have you considered adding a target = "_blank" attribute to the "Other formats" link so as not to "lose" the Wikisource page visitor?" Overall, this would help keep readers on the page they want to export, as is the behaviour when they use any of the other export links.
- When the "choose formats" link is selected in the sidebar, the link should open a new tab (rather than in the existing tab)
Visual Example of the link: