patch 9.1.1188: runtime(tera): tera support can be improved

Problem:  runtime(tera): tera support can be improved
Solution: update tera filetype plugin, include a tera syntax script
          include tera syntax tests, update the filetype test,
          update makemenu and synmenu vim scripts
          (MuntasirSZN)

closes: #16830

Signed-off-by: MuntasirSZN <muntasir.joypurhat@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/makemenu.vim b/runtime/makemenu.vim
index 6707f2b..8ef1788 100644
--- a/runtime/makemenu.vim
+++ b/runtime/makemenu.vim
@@ -2,7 +2,7 @@
 
 # Script to define the syntax menu in synmenu.vim
 # Maintainer:	The Vim Project <https://github.com/vim/vim>
-# Last Change:	2023 Aug 10
+# Last Change:	2025 Mar 09
 # Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 # This is used by "make menu" in the src directory.
@@ -605,6 +605,7 @@
 SynMenu T.Telix\ Salt:tsalt
 SynMenu T.Termcap/Printcap:ptcap
 SynMenu T.Terminfo:terminfo
+SynMenu T.Tera:tera
 SynMenu T.Tera\ Term:teraterm
 SynMenu T.TeX.TeX/LaTeX:tex
 SynMenu T.TeX.plain\ TeX:plaintex