patch 8.1.0103: long version string cannot be translated

Problem:    Long version string cannot be translated.
Solution:   Build the string in init_longVersion().
diff --git a/src/version.h b/src/version.h
index d3e575d..b94ab7e 100644
--- a/src/version.h
+++ b/src/version.h
@@ -36,5 +36,7 @@
 #define VIM_VERSION_NODOT	"vim81"
 #define VIM_VERSION_SHORT	"8.1"
 #define VIM_VERSION_MEDIUM	"8.1"
-#define VIM_VERSION_LONG	"VIM - Vi IMproved 8.1 (2018 May 17)"
-#define VIM_VERSION_LONG_DATE	"VIM - Vi IMproved 8.1 (2018 May 17, compiled "
+#define VIM_VERSION_LONG	"VIM - Vi IMproved 8.1 (2018 May 18)"
+#define VIM_VERSION_LONG_DATE	"VIM - Vi IMproved 8.1 (2018 May 18, compiled "
+#define VIM_VERSION_LONG_ONLY	"VIM - Vi IMproved 8.1"
+#define VIM_VERSION_DATE_ONLY	"2018 May 18"