Looking at the AIP, the tower is not listed as being "French only", so they should be able to speak English. You could try "Je voudrais parlée avec la tour sil vous plais". My spelling is probably wrong, along with my grammer, but it should be enough to get you through to ATC, who will hopefully speak English!
ATC hours are listed as "MON-FRI : 0700-1800 ; SAT, HOL : 0700-1000, 1200-1800"
Customs listed as "Customs, Police : TUE-SAT O/R the day before before 1600 - SUN, MON and HOL :the last working day before 1600 PN to TWR: ☎ 02 43 84 34 85."
You could try faxing them in English. A fax gives them time to translate, and formulate a reply! "FAX : 02 43 86 29 63" The country code is +33
You can find the AIP entry
by clicking here, and selecting the airport
Hope that helps!
dp