parse: Don't translate the "bin" element name

Otherwise we won't be able to create bins, there is no element called
"Behälter" if you're using a German locale.

https://bugzilla.gnome.org/show_bug.cgi?id=777998

gst/parse/grammar.y

@@ -1072,7 +1072,7 @@ assignments:	/* NOP */		      { $$ = NULL; }
 	|	ASSIGNMENT assignments 	      { $$ = g_slist_prepend ($2, $1); }
 	;
 
-binopener:	'('			      { $$ = gst_parse_strdup(_("bin")); }
+binopener:	'('			      { $$ = gst_parse_strdup("bin"); }
 	|	BINREF			      { $$ = $1; }
 	;
 bin:	binopener assignments chainlist ')'   {