I can't find a field...

MediaWiki doesn't have a link in that position. Is that a link to a user subpage/sandbox? It's probably a local JavaScript.

Than What to do to change this ? Please guide me.. Thank you....

You have to search that string in w:sa:Special:Search I think, and ask a local administrator to add your translation.

how may I know who is administrator of this ?

Hi, per sawiki's Special:listusers/sysop:

• Eukesh
• Hemant wikikosh
• MikeLynch
• Shubha

PS: That JS is located at w:sa:मिडीयाविकी:Gadget-mySandbox.js.

Liuxinyu970226 Thank you very very much...