Add cloudron-translation-update script

scripts/installer.sh

@@ -71,6 +71,12 @@ if ! which ipset; then
     apt install -y ipset
 fi
 
+# Only used for the cloudron-translation-update script
+if ! which unzip; then
+    echo "==> installer: installing unzip"
+    apt install -y unzip
+fi
+
 echo "==> installer: updating node"
 if [[ "$(node --version)" != "v10.18.1" ]]; then
     mkdir -p /usr/local/node-10.18.1