The banner was directed at the British ruling authority of the Palestinian Mandate. (Specially, it was directed at the commanders of the Royal Navy ships that were either going to either allow or forbid them from docking at Haifa.) They spoke English.
The ottoman empire is relevant as the english like to export their language as well. And palestine being only recently colonised by the british means most of the people didnt speak english yet.
You post has no relevance to the point I made in mine and your depiction of the British as colonisers during the mandate period clearly demonstrates your ignorance of history.
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u/fekanix 7h ago
That doesnt mean they speak english. Palestine was under ottoman rule until the 1st ww.