All the signs at CDG are in English and French. As you are approaching that section of the airport, you will see machines to purchase tickets all in a row.
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It depends where you go, most parts of Europe would be reasonably navigable with only speaking English. To be polite at least put in some effort to learn the language of the countries you are visiting. It's a small gesture and it will endear the locals to be more inclined to help you.
? Mandatory Instruction Signs - Red and White. Hold Lines, Runway Safety Areas, Runway Entrances, Restricted Areas, etc. Runway Hold Position - One of the most important airport signs that pilots should keep watch for is the runway hold position sign.
Once you are in Paris, the easiest way to get around is by bus or metro. There is also a tram network in the city. Fortunately, you don't have to wonder which option is best, as there is an integrated public transport system in operation.