Resolve "Préciser la comparaison à la normale dans l'infobulle"

Suite aux retours de la revue de sprint. Closes #108 (closed)

www-client/src/main/java/fr/agrometinfo/www/client/i18n/MapMessages.java

@@ -22,4 +22,23 @@ public interface MapMessages extends Messages {
      */
     @DefaultMessage("{0}: {1,number}&nbsp;{2}<br/>PRA: {3}<br/>Period: {4,date,medium} − {5,date,medium}")
     String popupContent(String indicator, Double value, String unit, String pra, Date startDate, Date endDate);
+
+    /**
+     * @param indicator indicator name
+     * @param sign      value sign
+     * @param value     indicator value
+     * @param unit      unit
+     * @param pra       Petite région agricole
+     * @param startDate start date of period
+     * @param endDate   date of last computation
+     * @return translation
+     */
+    @DefaultMessage("""
+    {0}<br/>
+    Comparison with the normal: {1}{2,number}&nbsp;{3}<br/>
+    PRA: {4}<br/>
+    Period: {5,date,medium} − {6,date,medium}
+    """)
+    String popupContentWithNormal(String indicator, String sign, Double value, String unit, String pra, Date startDate,
+        Date endDate);
 }