Typo3 Extension Flexform, outsourcing Language Files for your flexform

Maybe you have seen it in my last short tutorial “Typo3 Extension Flexform onchange reload” and wondered what I am doing there with

<sheetTitle>LLL:EXT:extension/res/lang/flexform.xml:sheet_general</sheetTitle>

What I am doing there is simple, I put all my translations in a different folder in res/lib/flexform.xml under my Exteion directory.

flexform.xml looks just like every other language.xml:

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<T3locallang>
        <meta type="array">
                <type>module</type>
                <description></description>
        </meta>
        <data type="array">
                <languageKey index="default" type="array">
                        <label index="options">Options</label>
                        <label index="backgroundImage">Background image</label>
                </languageKey>
                <languageKey index="de" type="array">
                        <label index="options">Optionen</label>
                        <label index="backgroundImage">Hintergrund Bild</label>
                </languageKey>
        </data>
</T3locallang>