I tested the latest SVN26475 and got an error message when I pressed the button to save the game.
ERROR: JavaScript error: gui/common/l10n.js line 69 Script value conversion check failed: v.isString() || v.isNumber() || v.isBoolean() (got type undefined) translate@gui/common/l10n.js:69:36 updateSavegameList/list<@gui/loadgame/SavegameList.js:134:35 updateSavegameList@gui/loadgame/SavegameList.js:129:38 initSavegameList@gui/loadgame/SavegameList.js:46:8 SavegameList@gui/loadgame/Sa