English translation: blade receptacle (female plug-in)
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Explanation: Flachstecker = flat plug -> flat pin
Steckerhülse (in der Steckdose) = pin bushing
I first was going to say "flat plug socket". But since the connector gets squeezed to make the connection firm, it must be something else.
Bushing is the usual translation for "Hülse".
Gopogle unfortunetly finds no matches when making an exact search.
Explanation: The complement to this is the Flackstecker or male quick disconnect solderless/crimp terminal. The are typically manufactured by Sta-Con or 3M (ScotchLocks). As appropriare you may choose to omit part of the decription and use female disconnect terminal for example.