Feedback from Waldir
The gadget should dynamically add a link to the terminology.json page from the Portal:kea page.
Done
Why dynamically? If it depends on {{Portal}} anyway (as it currently does), the template could add the whole link on its own, avoiding client-side JS and parts below the link moving down after the first paint.
@Tacsipacsi: Yes, I actually want to do that eventually when (fingers crossed) the gadget is ready to become a default gadget. But now in the beta stage, I think it is better to only show the link for those who have the gadget switched on. Users who don't have it switched on would only see the raw (well, prettified/tablified) JSON when visiting the terminology.json page, so I'm afraid that would just confuse people.
Then what about adding it in the template with display:none, and unhiding it in the gadget’s CSS? That would still cause a flash after first paint as gadget CSS is loaded with JavaScript, but the hiding is easier and less error-prone to remove when the gadget becomes default, and it’s also faster as we can save the AJAX request loading the necessary MediaWiki messages. (The flash could be resolved by using a peer gadget, but I don’t think it’s worth the effort for this temporary solution.)