Configure the locale

apache/Dockerfile

@@ -5,3 +5,8 @@ RUN apt update && \
 	apt -y full-upgrade
 
 RUN apt install -y apache2 libapache2-mod-php php php-mbstring php-pgsql php-gd php-imagick
+
+RUN apt install -y locales
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en