grep -nHi -e Translator: *.po
----------------------------- (without the 'en@quot' ones)

R-de.po:12:"Last-Translator: Detlef Steuer <steuer@hsu-hh.de>\n"
R-fr.po:6:"Last-Translator: Philippe.GROSJEAN@umons.ac.be\n"
R-pl.po:7:"Last-Translator: Łukasz Daniel <lukasz.daniel@gmail.com>\n"

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E-mails

To: Detlef Steuer <detlef.steuer@gmx.de, 
    Łukasz Daniel <lukasz.daniel@gmail.com, 
    Philippe.GROSJEAN@umons.ac.be