patch 8.2.4005: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more error messages to errors.h.
diff --git a/src/ex_eval.c b/src/ex_eval.c
index d9d6b2d..a48f609 100644
--- a/src/ex_eval.c
+++ b/src/ex_eval.c
@@ -1406,9 +1406,9 @@
 	    // If we are in a ":while" or ":for" but used the wrong endloop
 	    // command, do not rewind to the next enclosing ":for"/":while".
 	    if (fl & CSF_WHILE)
-		eap->errmsg = _("E732: Using :endfor with :while");
+		eap->errmsg = _(e_using_endfor_with_while);
 	    else if (fl & CSF_FOR)
-		eap->errmsg = _("E733: Using :endwhile with :for");
+		eap->errmsg = _(e_using_endwhile_with_for);
 	}
 	if (!(fl & (CSF_WHILE | CSF_FOR)))
 	{