Wonderful as always, and I’m particularly excited about proto-Indo-European! As always, I have nitpicks.
Some German errors: under National Socialist, “Deutshe” (in Deutshe Arbeiterpartei) should be Deutsche, and “Arbeiterpartie” (in Nationalsozialistische Deutsche Arbeiterpartie) s/b Arbeiterpartei; under U-boat, “unterseeboot” s/b Unterseeboot.
Under red giant, “Our sun will be become...”
Under looey, Why “in a way”? It is another war word, it’s just from a different war.
Under tank, you say without qualification “in the hope that the Germans would believe the large metal objects being shipped to France were water tanks”; I thought there was dispute over why it was so named?
Not a nitpick but an addition: fuck-all “appears in a British trial transcript from this year,” and I thought I’d quote the full sentence to give the flavor of army English of the day:
He then said, “You are a fucking coward & you will go to the trenches—I give fuck all for my life & I give fuck all for yours & I’ll get you fucking well shot.”
(From Record of the Trial of H. Farr, quoted in Jesse Sheidlower’s invaluable The F Word.)
Edit: You call proto-Indo-European “the ancestor of most European and many central-Asian languages”; are you sure central-Asian (which I would write Central Asian) is what you mean? Central Asia is normally taken to include Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan, sometimes with nearby areas like Mongolia, and the only Indo-European language spoken there is Tajik (a variety of Persian/Farsi). Did you mean South Asian?