Browsing Basque translation

Translators: This phrase is spoken to inform the user of all of the MathML
enclosure notations associated with a given mathematical expression. For
instance, the expression x+y could be enclosed by a box, or enclosed by a
circle. It could also be enclosed by a box and a circle and long division
sign and have a line on the left and on the right and a vertical strike.
(Though let's hope not.) Given that we do not know the enclosures, their
order, or their combination, we'll present them as a list. The string
substitution is for that list of enclosure types. For more information
about the MathML 'menclose' element and its notation types, see:
http://www.w3.org/TR/MathML3/chapter3.html#presm.menclose