55 chars = 9 words on average which will cost 0.63 € @ 0.07 €/word (including proofreading/QA).
Repetitions and fuzzy matches come with a discount (which usually amounts to 20% overall).
Example: 1000 words = 70 € minus 20% = 56 €.
Game translation agencies will charge more than that, but that's about the rate their translators (who are hired by the agencies) will work for.
I can offer some help with proofreading the translation (for free).
If you need any help please contact me at 5ev3nand9@gmail.com