enwiki does this by using local JS (in [[MediaWiki:Common.js]], search for "main page layout fixes"). A sysop can simply copy this piece of JS to bnwiki's [[MediaWiki:Common.js]]

Javascript shouldn't be used for that.

The ca-nstab-project tab seems to be done on PHP.

To hide the title and categories of নিবন্ধ add to MediaWiki:Common.css
body.page-প্রধান_পাতা h1.firstHeading, body.page-প্রধান_পাতা#catlinks { display:none; }

(In reply to comment #2)

Javascript shouldn't be used for that.

The ca-nstab-project tab seems to be done on PHP.

If I understand correctly, the reporter wants the tab on the main page to say "main page" (in Bengali). The ca-nstab-* messages only work per namespace.

The ca-nstab-* messages only work per namespace.

There must be a way to change them for the main page without using CSS or javascript

Please compare:

wget http://es.wikipedia.org/wiki/Wikipedia:Portada -O - --user-agent=Bug20987 | grep ca-nstab-project

<li id="ca-nstab-project" class="selected"><a href="/wiki/Wikipedia:Portada" title="Ver la página de proyecto [a]" accesskey="a">Portada</a></li>

wget http://es.wikipedia.org/wiki/Wikipedia:Café -O - --user-agent=Bug20987 | grep ca-nstab-project

<li id="ca-nstab-project" class="selected"><a href="/wiki/Wikipedia:Caf%C3%A9" title="Ver la página de proyecto [a]" accesskey="a">Página del proyecto</a></li>

Dear all, I had tried js and MediaWiki:Common.css.But it is not fixed. Please rethink our issue.

I have found how it is done on es.wikipedia: Using a parser function.
http://es.wikipedia.org/w/index.php?title=MediaWiki:Nstab-project&action=edit
Domas may want to kill some admin for doing that.

There is a message 'pagetitle-view-mainpage' for the title-tag, maybe add a new one for the namespace tab.

• This bug has been marked as a duplicate of bug 14267 ***