Hi! Here is a new german (de) translation. Your Mod has problems with ä, ü, ö, so the complete text or the word will not display. The last, surveillance-2 have i remove, will not display ingame. Is the same description as surveillance. Its ok so. So it is not translated 1:1, I used other words, but the meaning should be the same.

[entity-name]
big_brother-surveillance-center=Kontrollcenter
big_brother-surveillance-small=Kontrollkamera

[item-name]
big_brother-surveillance-center=Kontrollcenter

[technology-name]
radar-amplifier=Radius-Erweiterung
radar-efficiency=Scan-Geschwindigkeit
surveillance=Kontrollcenter

[technology-description]
radar-amplifier=Erweitert die Sichtlinie, sowie die Scan-Reichweite des Radars.
radar-efficiency=Scannt neue Sektoren schneller ab.
surveillance=Fahrzeuge, inkl. Schienenfahrzeuge sind auf der Map stehts sichtbar, auch große Strommasten.

hello, you don't have any Factorio-de community ?
for french player we have factorio-fr and 2-3 team of translater :)