The law is here:
https://www.legifrance.gouv.fr/loda/id/LEGITEXT000005616341/
Here the relevant translations:
Article 2: In the designation, offer, presentation, instructions for use or use, description of the scope and warranty conditions of a good, product or service, as well as in invoices and receipts, the use of the French language is compulsory. The same provisions apply to all written, spoken or audiovisual advertising.
Article 3: Any inscription or advertisement affixed or made on the public highway, in a place open to the public or in a means of public transport and intended for the information of the public must be formulated in French.
Article 5: ...contracts to which a legal person governed by public law or a private person performing a public service mission are parties are drawn up in French. They may not contain any foreign expression or term when there is a French expression or term with the same meaning approved under the conditions provided for by the regulatory provisions relating to the enrichment of the French language. ... The contracts referred to in this article concluded with one or more foreign co-contractors may include, in addition to being written in French, one or more versions in a foreign language which may also be authentic.
Article 6: Anyone participating in an event, a conference or a congress organized in France by natural or legal persons of French nationality has the right to speak French. Documents distributed to participants before and during the meeting to present the program must be written in French and may include translations into one or more foreign languages.
When an event, a colloquium or a congress gives rise to the distribution to the participants of preparatory documents or working documents, or to the publication of proceedings or reports of proceedings, the texts or interventions presented in a foreign language must be accompanied by at least a summary in French.
...
When a legal person governed by public law or a legal person governed by private law entrusted with a public service mission initiates the events referred to in this article, a translation system must be set up.
Article 7:
The publications, reviews and communications disseminated in France and which emanate from a legal person governed by public law, a private person exercising a public service mission or a private person benefiting from a public subsidy must, when they are written in a foreign language, include at least a summary in French.
Article 14:
I. The use of a trademark, trade or service made up of a foreign expression or term is prohibited for legal persons governed by public law when there is a French expression or term of the same. meaning approved under the conditions provided for by the regulatory provisions relating to the enrichment of the French language.
This prohibition applies to legal persons governed by private law entrusted with a public service mission, in the execution of that mission.
II. The provisions of this article do not apply to trademarks used for the first time before the entry into force of this law.