Add the PO files for wesnoth-tdg

Many of the CI builds expect the .po files to already exist, and
fail without them.

For SCons builds, the .pot file needs to exist, because po/SConscript
uses the existing files to find out which textdomains it needs to
update.

It was already added for CMake, but keeping the list in alphabetical
order makes maintenance easier.

po/CMakeLists.txt

@@ -20,9 +20,9 @@ set(NORMAL_DOMAINS
 	wesnoth-sota
 	wesnoth-sotbe
 	wesnoth-tb
+	wesnoth-tdg
 	wesnoth-thot
 	wesnoth-tools
-	wesnoth-tdg
 	wesnoth-trow
 	wesnoth-tsg
 	wesnoth-tutorial

po/wesnoth-tdg/LINGUAS

@@ -0,0 +1 @@
+af ang@latin ar bg bn ca ca_ES@valencia cs cy da de el en_GB en@shaw es es_419 eo et eu fi fr ga gd gl grc he hr hu id is it ja ko la lt lv mk mr my nl nb_NO pl pt pt_BR racv ro ru sk sl sr sr@ijekavian sr@ijekavianlatin sr@latin sv tl tr uk vi zh_CN zh_TW