[FIX] easy_my_coop: 't' in mail template

This fix weird 't' appearing in the translation of emails. There was a
mix of space and tab indentation in xml files. Tabulation indentation
generate \t code in fr_BE.po.

So this commit removes the tabulation indetation for xml file and fix
the translation in i18n/fr_BE.po.

easy_my_coop/data/mail_template_data.xml

@@ -18,16 +18,16 @@
             <field name="body_html"><![CDATA[
 <div style="font-family: 'Lucica Grande', Ubuntu, Arial, Verdana, sans-serif; font-size: 12px; color: rgb(34, 34, 34); background-color: #FFF; ">
 
-<p>Hello ${object.partner_id.name},</p>
+    <p>Hello ${object.partner_id.name},</p>
 
-<p>You will find in attachment all the necessary information for the payment. We kindly remind you that your subscription will be effective only once we received the payment.</p>
+    <p>You will find in attachment all the necessary information for the payment. We kindly remind you that your subscription will be effective only once we received the payment.</p>
 
-<p>Do not forget to add the structured communication to the payment.</p>
+    <p>Do not forget to add the structured communication to the payment.</p>
 
-<p>Sustainably your,</p>
-<p>${object.company_id.name}.</p>
+    <p>Sustainably your,</p>
+    <p>${object.company_id.name}.</p>
 
-% if object.company_id.street:
+    % if object.company_id.street:
         ${object.company_id.street}
     % endif
     % if object.company_id.street2:
@@ -79,7 +79,7 @@
     <p>Sustainably your,</p>
     <p>${object.company_id.name}.</p>
 
-% if object.company_id.street:
+    % if object.company_id.street:
         ${object.company_id.street}
     % endif
     % if object.company_id.street2:
@@ -133,7 +133,7 @@
     <p>Sustainably your,</p>
     <p>${object.company_id.name}.</p>
 
-% if object.company_id.street:
+    % if object.company_id.street:
         ${object.company_id.street}
     % endif
     % if object.company_id.street2: