European Factors to Watch-Shares set to halt 2-week rally

PARIS, Aug 22 (Reuters) - European stocks were set to inch lower in early trade on Friday, taking a breather following a brisk two-week rally, with investors turning cautious ahead of a speech by U.S. Federal Reserve Chair Janet Yellen. Financial spreadbetters expected Britain's FTSE 100 to open 2 points lower, or down 0.03 percent, Germany's DAX to open 5 points lower, or down 0.05 percent, and France's CAC 40 to open 3 points lower, or down 0.07 percent. Yellen was due to speak later i