And here I thought our "Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz" was as bad as it gets...

For English I prefer good ol' Antidisestablishmentarianism, but the new record holder is:
Pneumonoultramicroscopicsilicovolcanoconiosis - a lung disease caused by volcanic dust.

great... they got two brazilian chicks to do the portuguese word, and apparently the two never even heard the word before because they didn't say it correctly. they left out the anti- prefix at the beginning of the word

Just FYI: Our new longest word is since 2007 "Grundstücks­verkehrs­genehmigungs­zuständigkeits­übertragungs­verordnung" ...

For fucks sake, that's even worse...

googly translate interprets that word as, "Land transport permit transfer of competence regulation." Whacky Germans!

what about welsh "llanfairpwllgwyngyllgogerywyndrobwyllllantysiliogogogoch"

Come on, you're clearly just typing random gibberish....

Oh...
Nope.
That totally exists.
Short form is "Llanfairpwllgwyngyll"

A bit of a cop out, but Bangkok / Krung­thep­maha­nakorn­amorn­ratana­kosin­mahintar­ayutthay­amaha­dilok­phop­noppa­ra
trajathani­burirom­udom­rajaniwes­mahasat­harn­amorn­phimarn­avatarn­sathit­sakkattiya­visanuka
mprasit.

http://www.fun-with-words.com/longest_place_names.html

it's an amalgamation of words so probably doesn't count