patch 9.0.1967: xattr errors not translated

Problem:  xattr errors not translated
Solution: mark for translation, consistently capitalize
          first letter.

closes: #13236

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
diff --git a/src/os_unix.c b/src/os_unix.c
index 5ec45c8..9356db0 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -3186,7 +3186,7 @@
     vim_free(val);
 
     if (errmsg != NULL)
-	emsg((char *)errmsg);
+	emsg(_(errmsg));
 }
 #endif