It might be to do with your use of constants - I don't think you're supposed to modify them. However, I am far from a Ruby expert.
10XL do you know what's going on here?

Funny! Is map acceptable?

Great! Thanks.

Sorry @Kaiyou - we're on it! In the meantime, here's the list if you want to copy and paste:
english: 'Welcome',
czech: 'Vitejte',
danish: 'Velkomst',
dutch: 'Welkom',
estonian: 'Tere tulemast',
finnish: 'Tervetuloa',
flemish: 'Welgekomen',
french: 'Bienvenue',
german: 'Willkommen',
irish: 'Failte',
italian: 'Benvenuto',
latvian: 'Gaidits',
lithuanian: 'Laukiamas',
polish: 'Witamy',
spanish: 'Bienvenido',
swedish: 'Valkommen',
welsh: 'Croeso'

Hey @aryan-firouzian, could you please add the database of languages to the C# translation? I'm not sure what format it should take.

Thanks!

Thanks!

Thanks!

Sorry @petegarvin - I seem to be behind on discussion points! Glad you got it. And now I know too :-)

For some reason I don't seem to be able to see your translation 10XL. Are you able to re-post it?

Thanks so much for the suggestions - I have have updated the kata description.