LONDON (Reuters) - The euro and the dollar gained against the yen on Monday after the G20 decided not to criticize Japan for its expansionary policies, but Europe's weak growth outlook and the approach of Italian elections capped the moves. Financial leaders from the world's 20 biggest economies promised in their final statement after a weekend meeting not to devalue their currencies to boost exports, in a bid to defuse talk of currency wars among major nations. The euro gained 0.15 percent to 125.20 yen, edging up toward a 34-month high of 127. ...