I took a look at the site. Judging from the context, "strona" means site. I assume it's related to the Russian word storona which means side (I think the "bank" you got as a translation refers to a river bank, not a financial institution) and shares a root with strana, which means country or land.
I'm not sure what jedna means. I would guess that the phrase means something like "one such site," which would imply that the phrase is referring back to something else, or perhaps "such a site." If I really had to go out on a limb, I would surmise that it means "a very eclectic site." But that's only based on what I know of your site. Sorry I can't be of any definite help.
Umm, it looks like fanfiction.net is the site with the most fanfic, not that that helps you at all.