the GtkSwitch stateshave been indicated with two translator comments:

#. Translators: if the "on" state label requires more than three
#. * glyphs then use MEDIUM VERTICAL BAR (U+2759) as the text for
#. * the state

and

#. Translators: if the "off" state label requires more than three
#. * glyphs then use WHITE CIRCLE (U+25CB) as the text for the state

which means that if the strings used for the "on" and "off" states are longer than 3 glyphs, they should be translated to "❙" and "○", respectively.

thus, the translation for "on":

msgctxt "switch"
msgid "ON"
msgstr "ENCENDIDO"

and for "off":

msgctxt "switch"
msgid "OFF"
msgstr "APAGADO"

should either be removed, defaulting back to "ON" and "OFF", or should be translated to the UTF-8 glyphs above.