Wellcome, if you want to leave a message, please do it in my Portuguese discussion page and If you do not speak Portuguese... at least try. We try :) This experience was illuminating and helped me a lot to understand the controversy, the lobby and the motivations behind the different Wiki projects. "another brick on the wall" i would say ...
The Subject bar template is intended to be placed at the end of an article, after the References or External links and before any navboxes and categories. It offers a variant to several floating box templates that link to books, portals, and Wikipedia's sister projects but that typically cause formatting issues because of their size and alignment.
The template's documentation contains several examples where links to books, portals and sister projects are shown in various combinations, all within the one Subject bar template. It offers an alternative to the multiple variations of portal templates that may appear in the article's "See also" section.