Re-add Catalan as supported language

While Catalan got removed for Alpha 27 because of low coverage, its
coverage is now good enough again to get re-added as supported language.

source/tools/dist/0ad.nsi

@@ -90,6 +90,7 @@
   !insertmacro MUI_LANGUAGE "English" ; The first language is the default language
   !insertmacro MUI_LANGUAGE "Asturian"
   !insertmacro MUI_LANGUAGE "Basque"
+  !insertmacro MUI_LANGUAGE "Catalan"
   !insertmacro MUI_LANGUAGE "Czech"
   !insertmacro MUI_LANGUAGE "Dutch"
   !insertmacro MUI_LANGUAGE "Finnish"

source/tools/dist/build-archives.sh

@@ -16,7 +16,7 @@ echo "Filtering languages"
 # Included languages
 # Note: Needs to be edited manually at each release.
 # Keep in sync with the installer languages in 0ad.nsi.
-LANGS="ast cs de el en_GB es eu fi fr gl hu id it ja ko nl pl pt_BR pt_PT ru sk sv tr uk zh zh_TW"
+LANGS="ast ca cs de el en_GB es eu fi fr gl hu id it ja ko nl pl pt_BR pt_PT ru sk sv tr uk zh zh_TW"
 
 # shellcheck disable=SC2086
 REGEX=$(printf "\|%s" ${LANGS} | cut -c 2-)