patch 8.2.4008: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more error messages to errors.h.
diff --git a/src/profiler.c b/src/profiler.c
index 0aec862..00350ca 100644
--- a/src/profiler.c
+++ b/src/profiler.c
@@ -320,7 +320,7 @@
 	set_vim_var_nr(VV_PROFILING, 1L);
     }
     else if (do_profiling == PROF_NONE)
-	emsg(_("E750: First use \":profile start {fname}\""));
+	emsg(_(e_first_use_profile_start_fname));
     else if (STRCMP(eap->arg, "pause") == 0)
     {
 	if (do_profiling == PROF_YES)