Squashed commit of the following:

commit 9e767fa3e0788d87437c235e51fcdc4f26f75d98
Author: Julien Fastré <julien.fastre@champs-libres.coop>
Date:   Mon Jan 17 15:28:02 2022 +0100

    traductions

commit db65134743
Author: nobohan <juminet@gmail.com>
Date:   Mon Jan 17 12:17:22 2022 +0100

    add person: increase z-index of toast and wait for validation before closing modal

commit 7af4c3434e
Merge: a09c8ee8a 46c6d0e29
Author: Julien Fastré <julien.fastre@champs-libres.coop>
Date:   Sun Jan 16 22:51:45 2022 +0100

    Merge remote-tracking branch 'origin/master' into issue357_front_end_validation

commit a09c8ee8af
Author: nobohan <juminet@gmail.com>
Date:   Wed Jan 12 15:47:11 2022 +0100

    upd CHANGELOG

commit a312a9463d
Author: nobohan <juminet@gmail.com>
Date:   Wed Jan 12 15:29:32 2022 +0100

    address: display error message if some fields are empty (street & streetnumber)

commit 0035128138
Author: nobohan <juminet@gmail.com>
Date:   Wed Jan 12 14:47:43 2022 +0100

    address: display error message if some fields are empty

commit 49cb154672
Author: nobohan <juminet@gmail.com>
Date:   Tue Jan 11 20:58:00 2022 +0100

    address: add field validation (WIP)

commit 1a7ec9e396
Author: nobohan <juminet@gmail.com>
Date:   Tue Jan 11 17:16:43 2022 +0100

    Activity: fix vuejs warning

commit fa0b9271c2
Author: nobohan <juminet@gmail.com>
Date:   Tue Jan 11 16:13:23 2022 +0100

    location: treat 422 error when POSTing new location

commit c7b9a1a3fe
Author: nobohan <juminet@gmail.com>
Date:   Tue Jan 11 16:00:29 2022 +0100

    location: fix error when creating a new location: a new location could not be added to the availableLocations due to refactoring

commit f1c61a2387
Author: nobohan <juminet@gmail.com>
Date:   Tue Jan 11 15:20:33 2022 +0100

    person: treat 422 error in AddPerson for thirdparty

commit 8f6a70b240
Author: nobohan <juminet@gmail.com>
Date:   Tue Jan 11 11:30:05 2022 +0100

    person: add validation for required fields in on-the-fly person

commit 40e4bf953f
Author: nobohan <juminet@gmail.com>
Date:   Tue Jan 11 09:34:15 2022 +0100

    vuejs: better violations message in 422 error handling

commit 378f3a16fc
Author: nobohan <juminet@gmail.com>
Date:   Mon Jan 10 18:11:02 2022 +0100

    person: on-the-fly person: first implementation of makeFetch for posting person

src/Bundle/ChillMainBundle/Resources/public/vuejs/Address/components/EditPane.vue

@@ -7,6 +7,12 @@
          <span class="sr-only">Loading...</span>
       </div>
 
+      <div v-if="errors.length" class="alert alert-warning" >
+         <ul>
+            <li v-for="(e, i) in errors" :key="i">{{ e }}</li>
+         </ul>
+      </div>
+
       <h4 class="h3">{{ $t('select_an_address_title') }}</h4>
       <div class="row my-3">
          <div class="col-lg-6">
@@ -25,6 +31,8 @@
             <country-selection
                v-bind:context="context"
                v-bind:entity="entity"
+               v-bind:flag="flag"
+               v-bind:checkErrors="checkErrors"
                @getCities="$emit('getCities', selected.country)">
             </country-selection>
 
@@ -33,13 +41,17 @@
                v-bind:context="context"
                v-bind:focusOnAddress="focusOnAddress"
                v-bind:updateMapCenter="updateMapCenter"
+               v-bind:flag="flag"
+               v-bind:checkErrors="checkErrors"
                @getReferenceAddresses="$emit('getReferenceAddresses', selected.city)">
             </city-selection>
 
             <address-selection v-if="!isNoAddress"
                v-bind:entity="entity"
                v-bind:context="context"
-               v-bind:updateMapCenter="updateMapCenter">
+               v-bind:updateMapCenter="updateMapCenter"
+               v-bind:flag="flag"
+               v-bind:checkErrors="checkErrors">
             </address-selection>
 
          </div>
@@ -99,7 +111,9 @@ export default {
       'flag',
       'entity',
       'errorMsg',
-      'insideModal'
+      'insideModal',
+      'errors',
+      'checkErrors',
    ],
    emits: ['getCities', 'getReferenceAddresses'],
    data() {
@@ -128,7 +142,7 @@ export default {
          get() {
             return this.entity.selected.isNoAddress;
          }
-      }
+      },
    },
    methods: {
       focusOnAddress() {