i18n: cleanup gender locales

The dot in the localized key messes up with i18n-tasks, and causes
false positives for missing strings.

app/views/shared/dossiers/editable_champs/_civilite.html.haml

@@ -3,8 +3,8 @@
     Sélectionnez une des valeurs
   %label
     = form.radio_button :value, Individual::GENDER_FEMALE
-    = t(Individual::GENDER_FEMALE, scope: 'activerecord.attributes.individual.gender_options')
+    = Individual.human_attribute_name('gender.female')
 
   %label
     = form.radio_button :value, Individual::GENDER_MALE
-    = t('activerecord.attributes.individual.gender_options')[Individual::GENDER_MALE.to_sym] # GENDER_MALE contains a point letter
+    = Individual.human_attribute_name('gender.male')

app/views/users/dossiers/identite.html.haml

@@ -14,10 +14,10 @@
       .radios
         %label
           = f.radio_button :gender, Individual::GENDER_FEMALE, required: true
-          = t(Individual::GENDER_FEMALE, scope: 'activerecord.attributes.individual.gender_options')
+          = Individual.human_attribute_name('gender.female')
         %label
           = f.radio_button :gender, Individual::GENDER_MALE, required: true
-          = t('activerecord.attributes.individual.gender_options')[Individual::GENDER_MALE.to_sym] # GENDER_MALE contains a point letter
+          = Individual.human_attribute_name('gender.male')
 
     .flex
       .inline-champ

config/locales/models/individual/en.yml

@@ -6,6 +6,6 @@ en:
         nom: Last name
         prenom: First name
         birthdate: Date de naissance
-        gender_options:
-          "Mme": "Ms"
-          "M.": "Mr"
+      individual/gender:
+        female: Ms
+        male: Mr

config/locales/models/individual/fr.yml

@@ -6,6 +6,6 @@ fr:
         nom: Nom
         prenom: Prénom
         birthdate: Date de naissance
-        gender_options:
-          "Mme": "Madame"
-          "M.": "Monsieur"
+      individual/gender:
+        female: Madame
+        male: Monsieur