While processing LilyPond documentation in Catalan I noticed that I
get messages like
```
translation 1 error(s)
translated string: Inici del cap@'@dotless{i}tol actual o previ
Error messages:
@' expected braces
translation 1 error(s)
translated string: Cap@'@dotless{i}tol seg@"uent
Error messages:
@' expected braces
translation 1 error(s)
translated string: Entrada d'@'@dotless{i}ndex
Error messages:
@' expected braces
```
As it turns out, this comes directly from Texinfo, caused by file
`po_document/ca.po`. The fix is obvious: Either add braces around the
argument of `@'` or convert everything to real Unicode accent
characters.
Interestingly, the translated strings were there from the very
beginning (i.e., since 2016) – I guess this has worked then, and later
on Texinfo was modified somehow, and updating the PO file was
forgotten.
Werner
