Fixed broken run statement

Dockerfile

@@ -13,8 +13,7 @@ ENV DEBCONF_NOWARNINGS yes
 
 # Fix locale
 RUN locale-gen en_US.UTF-8
-echo "LANG=\"en_US.UTF-8\"" > /etc/default/locale
-echo "LANGUAGE=\"en_US:en\"" >> /etc/default/locale
+RUN echo "LANG=\"en_US.UTF-8\"" > /etc/default/locale && echo "LANGUAGE=\"en_US:en\"" >> /etc/default/locale
 
 # Install Jenkins
 RUN echo "deb http://pkg.jenkins-ci.org/debian binary/" > /etc/apt/sources.list.d/jenkins.list