Today we met with the site engineer again. It looks like, following our/electricians' complaints, the translator is no longer involved. We exposed our points to the site engineer. He made notes throughout the meeting.
He told us that electricians should start soon and finish in 2 weeks. Once that's done, the plumber will come to install pipes, sewage etc. Then the screed people will come in and finish the third part of the house.
He seemed much more responsive and communication flowed better in English. He promised a reply with the updates.