fix

Dockerfile

@@ -4,7 +4,7 @@ FROM node:12-stretch-slim
 # apt
 #COPY sources.list /etc/apt/sources.list
 RUN apt update && \
-    env DEBIAN_FRONTEND=noninteractive apt install -y build-essential libevent-dev libsqlite3-dev mono-complete p7zip-full envsubst curl && \
+    env DEBIAN_FRONTEND=noninteractive apt install -y build-essential libevent-dev libsqlite3-dev mono-complete p7zip-full gettext-base curl && \
     rm -rf /var/lib/apt/lists/* && \ 
     useradd -ms /bin/bash container