This app is just wonderful, but recently it stopped pronouncing words. I contacted the developer, and they responded immediately. Apparently Google changed something without notifying them, and that caused the problem. This is how to fix this issue on an iPhone: Tap the speaker icon at the top right of any dictionary word screen and turn off the switch for "Use better quality online voices when available." Then make sure the volume is turned up and try again. This totally solved the problem.
Marta Waterman about French Translator Dictionary +, v6.2.71