Hm, as I wrote in another thread, I updated from rev6618 to rev6773. There was a little problem with the lexicons, so I emptied the lexicon_entries table and pressed the button "Revert All Core Entries" in the Lexicon Manager. If I remember correctly, in older versions this pushed the changed phrases from the lexicon files to the database. But the table stays empty. This doesn’t seem to be a big problem - the Manager UI is displayed correctly -, but by chance I saw that the Language Builder now just exports the setup language files; the core lexicons are missing (presumably because they are read from the database, not from the files).
Is there an easy way to copy the phrases to the database again or do I have to write a little script for it? Now that the other two lexicon database tables are gone, how are the topics identified?

By name? In older versions there were IDs of the topics table.
Or is the Language Builder now completely obsolete?
Thank you very much in advance for any hint.
Cheers,
Jan