That is why it occurred to me to try and put in numbers the collection so far. (And yes, I realise, that we have had other multlingual collections, but so far I've only prepared stats for this one).So far there have been 26 catalogued volumes (with volume 27 currently open for submissions) with the first one catalogued on 24.02.2012. These contain 518 pieces of poetry, prose and even small plays in 44 languages. Of these languages the one with the greatest number of sections if easily Japanese with 75 sections, followed by Polish with 49 and French with 48.
The full list of languages is as follows (from most sections to fewest)
Japanese, Polish, French, Italian, Spanish, Russian, German, Romanian, Latin, Portuguese, Galician, Luxembourgish, Tagalog, Esperanto, Dutch, Ukrainian, Danish, Chinese, Slovenian (5 Slovenian sections, all in one volume), Ancient Greek, Swedish, Arabic, Finnish, Bisaya, Hindi, Hebrew, Czech, Serbian, finally Attic Greek, Farsi, Bulgarian, Welsh, Yidish, Low Geman, Hungarian, Norwegian, Lithuanian, Kurdish, Middle English, Old Tupi, Marathi, Macedonian, Maltese, Old English are all represented by a single section (these statistics do not include volume 27)
The greatest number of languages in a volume was 14 (volume 001) followed by 13 in volume 025. On the other hand volumes 004 and 005 featured only 4 languages.
The greatest number of sections in a single language in a volume was 13. That is how many sections in Galician there are in volume 015.
The most prolific reader for the Multilingual Short Work Collection is ekzemplaro, whose indefatigable work gave us the majority of sections in Japanese that we have in the catalogue.
And, last but defintely not least, here's the list of those that kept the collection open for anyone willing to contribute: Leni, Lezer, HokusPocus, Icequeen and ToddHW have MCed the successive volumes, while ekzemplaro, ShiNeko and kazbek BCed the installments appearing throughout those years.
Unfortunately, I don't have the most important statistics i.e the one about the actual number of readers who the contributed, as that would require way more time to compile.
Comments, corrections and suggestions welcome
a wonderful tribute to our multilingual endeavours, thank you, Piotr. 
I agree, very often, when they have not been active for many years, they will probably also not have email alert anymore. But it's worth a try.