Update Postgres instructions for Ubuntu

We were getting an enconding exception when running `rake db:create`.

This post from stackoverlow seems to fix it
https://stackoverflow.com/questions/13115692/encoding-utf8-does-not-match-locale-en-us-the-chosen-lc-ctype-setting-requires

docs/en/installation/ubuntu.md

@@ -83,6 +83,36 @@ You also need to configure a user for your database. As an example, we'll choose
 sudo -u postgres createuser consul --createdb --superuser --pwprompt
 ```
 
+To make sure the UTF-8 enconding is used, create a file:
+
+```
+sudo nano /etc/profile.d/lang.sh
+```
+
+Add the following:
+
+```
+export LANGUAGE="en_US.UTF-8"
+export LANG="en_US.UTF-8"
+export LC_ALL="en_US.UTF-8"
+```
+
+Reconfigure Postgres to use the UTF-8 encoding:
+
+`````
+sudo su - postgres
+psql
+
+update pg_database set datistemplate=false where datname='template1';
+drop database Template1;
+create database template1 with owner=postgres encoding='UTF-8'
+lc_collate='en_US.utf8' lc_ctype='en_US.utf8' template template0;
+update pg_database set datistemplate=true where datname='template1';
+
+\q
+exit
+`````
+
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