Although 'an hotel' is used by some, 'a hotel' is more common, and follows the rule that if a word begins with a consonant sound, 'h' in this case, 'a' should be used.
A hotel is not an error. You can use the report button to suggest alternative translations, but don't expect correct uses of the English language to be removed simply because it's not how you'd say it.
Have to agree with the other posts here, I wrote 'an hotel', generally considered correct in the UK as the H is almost silent, and was told I had made a typo. I assume this relates to the app being written for US English, not UK. An hotel should be marked correct with no typo.