Is that right?
每个星期三五从8点到12点半为了你们有翻译服务

Question

Answer

there should be a subject. If you are talking about yourself, you can say:
我每周三和周五从8点到12点半提供翻译服务

Answer

нет, вот эта часть 为了你们有翻译服务 не соответствует порядку слов в предложении и смысловому построению фразы

Answer

每周三至周五（every Wednesday to Friday）从8点到12点半提供翻译服务 or 每周三和周五（every Wednesday and Friday）从8点到12点半提供翻译服务

Answer

it was an notice in the one italian office

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need another language version, or provide more context/informaion.