import translation with wrong credit

I spent a lot of time and work to translate SchoolTool project (I
translated a lot of phrases.). I used the export function, and then
imported the new file with my translations added. Unfortunately, no
translations have been assigned to me. Now I know that I should
change manually:

"Last-Translator: Zbigniew Pyttel <***@gmail.com>\n" on line
12 on:
"Last-Translator: Łukasz Szeremeta <***@gmail.com>\n"

Now all uploaded by me phrases (there were a lot) have been assigned to
another person (Zbigniew Pyttel).

I know that maybe the translation is not perfect. So I want to be
responsible for my own translation. I want to take responsibility for my
translation - I but not the other person.

I send translations:

1) translation before my changes:
-- I'll send it persons responsible for the Launchpad (please inquire). I do not want publicly placed my e-mail (SPAM, etc.). I'll change it in my profile change for some time. SchoolTool owners have my e-mail and this translations. --
2) translation after my changes, but without modified line (described
above): -- I'll send it persons responsible for the Launchpad (please inquire). I do not want publicly placed my e-mail (SPAM, etc.). I'll change it in my profile change for some time. SchoolTool owners have my e-mail and this translations. --
3) translation after my changes and with modified line:
-- I'll send it persons responsible for the Launchpad (please inquire). I do not want publicly placed my e-mail (SPAM, etc.). I'll change it in my profile change for some time. SchoolTool owners have my e-mail and this translations. --

I sent the earlier translation (2012-03-29 22:17:31 UTC) in the hope of
restoring its to re-import my translation immediately after.

Can you delete translations or change the author's credit?

Shortly:

Translation: Polish
Project: SchoolTool

Thank you in advance for your help.