To reproduce:
Go to https://he.m.wikipedia.org/w/index.php?title=ASCII&article_action=edit#editor/0
Expected: To see a bar at the top with an X on the right, "Editing ASCII" in the middle, and an arrow on the left.
Observed: The bar is not visible.
Because of this bug it's impossible to save the edits.
This happened to me and to another Hebrew Wikipedia editor with Android 2.3.4.
This does work in the English Wikipedia, and with Android 4.
Version: unspecified
Severity: normal