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Android: Unable to add enter/cancel/shift buttons in the layout editor #777
This is happening at least with the Spanish translation, untested with other locales, verified at least in 4.4.4 and 5.0.1.
When selecting Enter (Z), Cancel (Esc and X) and Shift options, the system shows the toast with "Button not supported on this API" message (btw, this toast message text itself is not in the translation list).
This is weird, I'm sure it used to work. For me this problem happens with the Z/X buttons, but the Shift button works.