app, po: revert commit a0724783 and add a TRANSLATORS comment.
Not using %d in the singular form of English does not prevent other languages to use %d in any form they wish to. This will still work and will still be replaced by the relevant number of images. So I revert commit a0724783 because it is just prettier (in English) to write "An image" rather than "1 image", but this does not mean you have to do the same in other languages! Adding a comment so that translators know about it. Also directly modify the msgid in the Polish and Russian translations which already translated this string, so that the translations does not end up unnecessarily fuzzy.
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