function diffTexts(mTextsMain, mTextsToDiff) {
			var aDiffs = [];
			Object.keys(mTextsMain).forEach(function(sKey) {
				if (!(sKey in mTextsToDiff && mTextsMain[sKey] === mTextsToDiff[sKey])) {
					aDiffs.push(sKey);
				}
			});
			return aDiffs;
		}
Checks which keys are not present in mTextsToDiff or their values are different

@param {Object<string,string>} mTextsMain The map of texts to compare
@param {Object<string,string>} mTextsToDiff The map of texts to compare against
@returns {Array} An array containing all keys for which there is difference
@private