Names of namespaces
This is the one that is called "$1_talk" in the table. "$1" will be replaced by "Wikipedia" ("ਵਿਕਿਪੀਡਿਆ") in Wikipedia, by "Wiktionary" in Wiktionary, etc. You don't have to put "$1" in the beginning of the translation. Put "$1" wherever it fits in Punjabi.
Sorry, I didn't get the last two lines. As of previous lines: I can't translate $1 so how to translate the namespace ਵਿਕਿਪੀਡਿਆ: that is wrongly spelled and also the same wrong spellings have been used for the logo.
If I understand correctly, "ਵਿਕਿਪੀਡਿਆ" is the word "Wikipedia" and it looks the same as in the logo. Do you want to change the name of the site? It is possible, but it is not done on translatewiki.net, and you should discuss it in the Community Portal of the Punjabi Wikipedia first.
Or are you talking about the "Wikipedia talk" namespace (ਵਿਕਿਪੀਡਿਆ ਚਰਚਾ)?
I'm talking about everywhere the word "wikipedia" is used in Punjabi as ਵਿਕਿਪੀਡਿਆ. It's spelled wrong and a users also pointed this out to me. There is also a namespace called "Wikipedia:" and of course "Wikipedia talk:" on every wiki, I first want to translate/correct the word for this namespace. For the site name I'll discuss it with the community, of course, and I'm sure they'll support me but please help for this namespace.