diff --git a/packages/core/admin/admin/src/pages/AuthPage/utils/forms.js b/packages/core/admin/admin/src/pages/AuthPage/utils/forms.js
index 5349fc27cc..ec4239ee34 100644
--- a/packages/core/admin/admin/src/pages/AuthPage/utils/forms.js
+++ b/packages/core/admin/admin/src/pages/AuthPage/utils/forms.js
@@ -52,7 +52,7 @@ const forms = {
     fieldsToDisable: ['email'],
     fieldsToOmit: ['userInfo.confirmPassword', 'userInfo.news', 'userInfo.email'],
     schema: yup.object().shape({
-      firstname: yup.string().required(translatedErrors.required),
+      firstname: yup.string().trim().required(translatedErrors.required),
       lastname: yup.string(),
       password: yup
         .string()
@@ -76,7 +76,7 @@ const forms = {
     fieldsToDisable: [],
     fieldsToOmit: ['confirmPassword', 'news'],
     schema: yup.object().shape({
-      firstname: yup.string().required(translatedErrors.required),
+      firstname: yup.string().trim().required(translatedErrors.required),
       lastname: yup.string(),
       password: yup
         .string()
diff --git a/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/ListPage/ModalForm/utils/schema.js b/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/ListPage/ModalForm/utils/schema.js
index 9ae27dd2c5..adf046691b 100644
--- a/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/ListPage/ModalForm/utils/schema.js
+++ b/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/ListPage/ModalForm/utils/schema.js
@@ -2,7 +2,7 @@ import * as yup from 'yup';
 import { translatedErrors } from '@strapi/helper-plugin';
 
 const schema = yup.object().shape({
-  firstname: yup.string().required(translatedErrors.required),
+  firstname: yup.string().trim().required(translatedErrors.required),
   lastname: yup.string(),
   email: yup.string().email(translatedErrors.email).required(translatedErrors.required),
   roles: yup.array().min(1, translatedErrors.required).required(translatedErrors.required),
diff --git a/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/utils/validations/users/profile.js b/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/utils/validations/users/profile.js
index 3b241c1447..69b5a14668 100644
--- a/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/utils/validations/users/profile.js
+++ b/packages/core/admin/admin/src/pages/SettingsPage/pages/Users/utils/validations/users/profile.js
@@ -2,8 +2,8 @@ import * as yup from 'yup';
 import { translatedErrors } from '@strapi/helper-plugin';
 
 export const commonUserSchema = {
-  firstname: yup.mixed().required(translatedErrors.required),
-  lastname: yup.mixed(),
+  firstname: yup.string().trim().required(translatedErrors.required),
+  lastname: yup.string(),
   email: yup.string().email(translatedErrors.email).lowercase().required(translatedErrors.required),
   username: yup.string().nullable(),
   password: yup
diff --git a/packages/core/admin/admin/src/translations/fr.json b/packages/core/admin/admin/src/translations/fr.json
index cbbad21d1a..43c40de4a3 100644
--- a/packages/core/admin/admin/src/translations/fr.json
+++ b/packages/core/admin/admin/src/translations/fr.json
@@ -588,6 +588,38 @@
   "content-manager.success.record.save": "Sauvegardé",
   "content-manager.success.record.unpublish": "Publication annulée",
   "content-manager.utils.data-loaded": "{number, plural, =1 {L'entrée a été chargée} other {Les entrées on été chargées} avec  succès",
+  "content-manager.apiError.This attribute must be unique": "Le champ {field} doit être unique",
+  "form.button.continue": "Continuer",
+  "global.search": "Rechercher",
+  "global.actions": "Actions",
+  "global.back": "Retour",
+  "global.cancel": "Annuler",
+  "global.change-password": "Modifier le mot de passe",
+  "global.content-manager": "Gestion du contenu",
+  "global.continue": "Continuer",
+  "global.delete": "Supprimer",
+  "global.delete-target": "Supprimer {target}",
+  "global.description": "Description",
+  "global.details": "Détails",
+  "global.disabled": "Désactivé",
+  "global.documentation": "Documentation",
+  "global.enabled": "Activé",
+  "global.finish": "Terminer",
+  "global.marketplace": "Marketplace",
+  "global.name": "Nom",
+  "global.none": "Aucun",
+  "global.password": "Mot de passe",
+  "global.plugins": "Plugins",
+  "global.profile": "Profil",
+  "global.reset-password": "Réinitialiser le mot de passe",
+  "global.roles": "Rôles",
+  "global.save": "Enregistrer",
+  "global.see-more": "Voir plus",
+  "global.select": "Sélectionner",
+  "global.select-all-entries": "Sélectionner toutes les entrées",
+  "global.settings": "Paramètres",
+  "global.type": "Type",
+  "global.users": "Utilisateurs",
   "form.button.done": "Terminer",
   "global.prompt.unsaved": "Êtes-vous sûr de vouloir quitter cette page? Toutes vos modifications seront perdues",
   "notification.contentType.relations.conflict": "Le Type de Contenu à des relations qui rentrent en conflit",
diff --git a/packages/core/admin/server/validation/common-validators.js b/packages/core/admin/server/validation/common-validators.js
index 64716bd0df..42193d7ced 100644
--- a/packages/core/admin/server/validation/common-validators.js
+++ b/packages/core/admin/server/validation/common-validators.js
@@ -16,7 +16,7 @@ const getActionFromProvider = (actionId) => {
 
 const email = yup.string().email().lowercase();
 
-const firstname = yup.string().min(1);
+const firstname = yup.string().trim().min(1);
 
 const lastname = yup.string();
 
diff --git a/packages/core/strapi/lib/commands/admin-create.js b/packages/core/strapi/lib/commands/admin-create.js
index 967a58cc69..754c8b156a 100644
--- a/packages/core/strapi/lib/commands/admin-create.js
+++ b/packages/core/strapi/lib/commands/admin-create.js
@@ -17,7 +17,7 @@ const passwordValidator = yup
 const adminCreateSchema = yup.object().shape({
   email: emailValidator,
   password: passwordValidator,
-  firstname: yup.string().required('First name is required'),
+  firstname: yup.string().trim().required('First name is required'),
   lastname: yup.string(),
 });