Add script to sync the classref

Needs to be run from a Git repo with the right version compiled.
The location of the Godot binary to use for doctool, and the godot-docs-l10n
clone, can be specified on the command line.

classref-export.sh

@@ -0,0 +1,35 @@
+#/bin/bash
+
+: ${GODOT_BIN:="./bin/godot.linuxbsd.editor.dev.x86_64"}
+: ${GODOT_DOCS_L10N:="../godot-docs-l10n"}
+
+if [ ! -f "${GODOT_BIN}" ]; then
+  echo "Couldn't locate Godot binary '${GODOT_BIN}'. This script must be run from a compiled Godot repo, and GODOT_BIN passed as environment variable if needed."
+  exit 1
+fi
+
+if [ ! -d "${GODOT_DOCS_L10N}" ]; then
+  echo "Couldn't locate godot-docs-l10n clone at '${GODOT_DOCS_L10N}'. Clone it in that location or override the path GODOT_DOCS_L10N passed as environment variable."
+  exit 1
+fi
+
+declare -A lang_remap=(
+ ["zh_Hans"]="zh_CN"
+ ["zh_Hant"]="zh_TW"
+)
+
+rm -rf ${GODOT_DOCS_L10N}/classes
+mkdir ${GODOT_DOCS_L10N}/classes
+
+for lang in es fr it ru uk zh_Hans zh_Hant; do
+  rtd_lang=$lang
+  if [ "${lang_remap[$lang]+found}" ]; then
+    rtd_lang=${lang_remap[$lang]}
+  fi
+  echo -e "\n✨ Exporting classref translations for $lang (RTD: $rtd_lang).\n"
+  ${GODOT_BIN} --doctool -l $lang
+  make -C doc rst LANGARG=$lang || true
+  rm -rf ${GODOT_DOCS_L10N}/classes/$rtd_lang
+  cp -r doc/_build/rst/ ${GODOT_DOCS_L10N}/classes/$rtd_lang
+  git checkout .
+done