patch 8.1.0315: helpgrep with language doesn't work properly

Problem:    Helpgrep with language doesn't work properly. (Takuya Fujiwara)
Solution:   Check for the language earlier. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index 55d3ce3..6b79b6e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    315,
+/**/
     314,
 /**/
     313,