[pablgonz]

In Spanish classrooms, signed numbers are taught as "dos negativo", "uno positivo": (−2) + (+1) is "dos negativo más uno positivo". With Verbose verbosity, Spanish now reads a number with a sign inside parentheses that way. Only Spanish files are touched.

input	Terse / Medium	Verbose
(−2) + (+1)	menos 2 más, abrir paréntesis más 1 cerrar paréntesis	2 negativo más 1 positivo
3 − (−2)	3 menos menos 2	3 menos 2 negativo
(−2)^2	abrir paréntesis menos 2 cerrar paréntesis al cuadrado	2 negativo elevado al cuadrado
−2 + 1	menos 2 más 1	menos 2 más 1

• Only numbers in parentheses: there the sign can't be an operation. Without parentheses, and with letters ((−x)), the reading doesn't change.
• The sign is spoken by the plus/minus node, so navigation says "2 negativo" too.
• Same in ClearSpeak and SimpleSpeak; not in literal mode.
• Tests in tests/Languages/es/{ClearSpeak,SimpleSpeak}/functions.rs and navigate.rs. cargo test passes.

[github-actions]

Linux library size: 0.59 MiB (0.00%)

Revision	Release liblibmathcat.so
Base (598020b)	0.59 MiB (618,920 bytes)
PR (0127d4a)	0.59 MiB (618,920 bytes)
Change	0 bytes (0.00%)

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