Update switchboard.en.md

docs/switchboard.en.md

-# Unfortunately this document is available in German only. An English version will be available shortly.
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+# Unfortunately this document is available in German only. An English version will be available shortly.
+
+
+<!--- in Arbeit von Lukas
+
+Achtung: Für Bilder die englische Textgrid-Version verwenden!
+
+Ansonsten Übersetzung der deutschen Doku
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