diff --git a/includes/lang/ca.php b/includes/lang/ca.php
index 116927d..9e00a01 100644
--- a/includes/lang/ca.php
+++ b/includes/lang/ca.php
@@ -316,6 +316,9 @@ return [
     'fc_err_fetch_gov'          => 'Error en la connexió amb l\'API governamental.',
     'fc_err_no_data_gov'        => 'No s\'han trobat dades a l\'API del govern per a aquest any.',
     'fc_err_action'             => 'Error en l\'acció: ',
+    'fc_err_select_leave'         => "Si us plau, selecciona un tipus de permís.",
+'fc_confirm_del_catalog'      => "Voleu eliminar definitivament el permís %s del catàleg? Això també el retirarà dels membres que l'utilitzen.",
+'fc_confirm_del_member_leave' => "Estàs segur que vols retirar aquest permís per a aquest membre?",
     'fc_today_short'            => 'Avui',
     'fc_today_title'            => 'Anar a avui',
     'fc_tab_foyer'            => '🏡 Llar',
diff --git a/includes/lang/en.php b/includes/lang/en.php
index c34c6d6..bdc21dc 100644
--- a/includes/lang/en.php
+++ b/includes/lang/en.php
@@ -317,6 +317,9 @@ return [
     'fc_err_fetch_gov'          => 'Error connecting to the government API.',
     'fc_err_no_data_gov'        => 'No data found on the government API for this year.',
     'fc_err_action'             => 'Error during action: ',
+    'fc_err_select_leave'         => "Please select a leave type.",
+'fc_confirm_del_catalog'      => "Permanently delete leave %s from the catalog? This will also remove it from members using it.",
+'fc_confirm_del_member_leave' => "Do you really want to remove this leave for this member?",
     'fc_today_short'            => 'Today',
     'fc_today_title'            => 'Today',
     'fc_tab_foyer'            => '🏡 Household',
diff --git a/includes/lang/fr.php b/includes/lang/fr.php
index 35c3a6f..25db5a7 100644
--- a/includes/lang/fr.php
+++ b/includes/lang/fr.php
@@ -318,6 +318,9 @@ return [
     'fc_err_fetch_gov'          => 'Erreur lors de la connexion à l\'API gouvernementale.',
     'fc_err_no_data_gov'        => 'Aucune donnée trouvée sur l\'API du gouvernement pour cette année.',
     'fc_err_action'             => 'Erreur lors de l\'action : ',
+    'fc_err_select_leave'         => "Veuillez sélectionner un type de congé.",
+'fc_confirm_del_catalog'      => "Supprimer définitivement le congé %s du catalogue ? Cela le retirera également des membres qui l'utilisent.",
+'fc_confirm_del_member_leave' => "Voulez-vous vraiment retirer ce congé pour ce membre ?",
     'fc_today_short'            => 'Auj.',
     'fc_today_title'            => "Aujourd'hui",
     'care_nounou' => 'Nounou',
diff --git a/modules/budget/views/budget_prev.php b/modules/budget/views/budget_prev.php
index dd98d20..d50f4b7 100644
--- a/modules/budget/views/budget_prev.php
+++ b/modules/budget/views/budget_prev.php
@@ -794,7 +794,7 @@ function duplicateMonth() {
     const parentMap = window.CONFIG.parentMapping;
 
     if (!sourceDateStr) {
-        alert(tr('bud_prev_err_no_history'));
+        showToast(tr('bud_prev_err_no_history'), 'error');
         return;
     }
 
@@ -955,10 +955,10 @@ async function validateTransfers(personCss, month) {
         if(result.success) {
             window.location.reload();
         } else {
-            alert(tr('bud_err_tech') + " : " + result.error);
+            showToast(tr('bud_err_tech') + " : " + (result.error || "Inconnue"), 'error');
         }
     } catch(e) {
-        alert(tr('bud_err_tech'));
+        showToast(tr('bud_err_tech'), 'error');
     }
 }
 
@@ -1035,13 +1035,13 @@ async function handleAdvanceSubmit(event, form) {
         if (result.success) {
             window.location.reload();
         } else {
-            alert((tr('bud_err_tech') || "Erreur") + " : " + (result.error || "Opération échouée"));
+            showToast((tr('bud_err_tech') || "Erreur") + " : " + (result.error || "Opération échouée"), 'error');
             btnSubmit.disabled = false;
             btnSubmit.innerHTML = oldText;
         }
     } catch (err) {
         console.error("AJAX Error:", err);
-        alert(tr('bud_err_tech') || "Une erreur technique est survenue.");
+        showToast(tr('bud_err_tech') || "Une erreur technique est survenue.", 'error');
         btnSubmit.disabled = false;
         btnSubmit.innerHTML = oldText;
     }
@@ -1155,7 +1155,7 @@ document.querySelectorAll('#addCatModal form, #editCatModal form').forEach(form
                 alert((tr('bud_err_tech') || 'Erreur') + " : " + (result.error || "Inconnue"));
             }
         } catch (error) {
-            alert(tr('bud_err_tech') || "Une erreur technique est survenue.");
+            showToast(tr('bud_err_tech') || "Une erreur technique est survenue.", 'error');
         } finally {
             submitBtn.disabled = false;
             submitBtn.innerText = originalText;
diff --git a/modules/budget/views/epargne.php b/modules/budget/views/epargne.php
index 8f84971..4678667 100644
--- a/modules/budget/views/epargne.php
+++ b/modules/budget/views/epargne.php
@@ -306,10 +306,10 @@ async function promptNewSavingsLine(owner, latestMonth) {
         if (result.success) {
             window.location.reload();
         } else {
-            alert(window.I18N['bud_err_tech'] + " : " + (result.error || "Erreur"));
+            showToast(window.I18N['bud_err_tech'] + " : " + (result.error || "Erreur"), 'error');
         }
     } catch (err) {
-        alert(window.I18N['bud_err_tech']);
+        showToast(window.I18N['bud_err_tech'], 'error');
     }
 }
 
@@ -330,7 +330,7 @@ async function updateEpargneCell(month, category, owner, inputEl) {
             return;
         }
     } catch (err) {
-        alert(window.I18N['bud_err_tech']);
+        showToast(window.I18N['bud_err_tech'], 'error');
         return;
     }
 
@@ -472,7 +472,7 @@ if (savingsForm) {
                 submitBtn.disabled = false;
             }
         } catch (error) {
-            alert(window.I18N['bud_err_tech']);
+            showToast(window.I18N['bud_err_tech'], 'error');
             submitBtn.innerText = originalText;
             submitBtn.disabled = false;
         }
@@ -495,7 +495,7 @@ async function deleteEntireMonth(monthDate, owner) {
         if (result.success) window.location.reload();
         else alert(result.error || window.I18N['bud_err_delete']);
     } catch(err) {
-        alert(window.I18N['bud_err_delete']);
+        showToast(window.I18N['bud_err_tech'], 'error');
     }
 }
 
diff --git a/modules/budget/views/provisions.php b/modules/budget/views/provisions.php
index 30a477a..ea3df3d 100644
--- a/modules/budget/views/provisions.php
+++ b/modules/budget/views/provisions.php
@@ -184,7 +184,7 @@ if (formAdd) {
                 submitBtn.disabled = false;
             }
         } catch (error) {
-            alert(window.I18N['bud_err_tech']);
+            showToast(window.I18N['bud_err_tech'], 'error');
             submitBtn.innerText = originalText;
             submitBtn.disabled = false;
         }
@@ -205,7 +205,7 @@ async function deleteProvision(id) {
             alert(result.message);
         }
     } catch(err) {
-        alert(window.I18N['bud_err_tech']);
+        showToast(window.I18N['bud_err_tech'], 'error');
     }
 }
 
diff --git a/modules/budget/views/suivi.php b/modules/budget/views/suivi.php
index c504509..512b9ad 100644
--- a/modules/budget/views/suivi.php
+++ b/modules/budget/views/suivi.php
@@ -1020,11 +1020,11 @@ document.addEventListener('DOMContentLoaded', () => {
                     formExpense.reset();
                     window.location.reload(); 
                 } else {
-                    alert((window.I18N['error_occured'] || 'Erreur') + ' : ' + (result.error || 'Inconnue'));
+                    showToast((window.I18N['error_occured'] || 'Erreur') + ' : ' + (result.error || 'Inconnue'), 'error');
                 }
             } catch (error) {
                 console.error("Erreur réseau :", error);
-                alert(window.I18N['bud_err_tech'] || "Erreur critique réseau.");
+                showToast(window.I18N['bud_err_tech'] || "Erreur critique réseau.", 'error');
             } finally {
                 submitBtn.disabled = false;
                 submitBtn.innerText = originalBtnText;
diff --git a/modules/family-calendar/family-calendar.js b/modules/family-calendar/family-calendar.js
index ba02891..ea0ac76 100644
--- a/modules/family-calendar/family-calendar.js
+++ b/modules/family-calendar/family-calendar.js
@@ -54,7 +54,7 @@ async function openCalendarSettings() {
       document.body.classList.add("no-scroll");
     }
   } catch (err) {
-    alert((tr("fc_error") || "Erreur : ") + err.message);
+    showToast((tr("fc_error") || "Erreur : ") + err.message, "error");
   }
 }
 
@@ -137,11 +137,10 @@ async function submitCalFoyer(e) {
         tr("fc_settings_updated") || "Configuration enregistrée !",
         "success",
       );
-    else alert(tr("fc_settings_updated") || "Configuration enregistrée !");
 
     setTimeout(() => window.location.reload(), 800);
   } catch (err) {
-    alert("Erreur : " + err.message);
+    showToast((tr("fc_error") || "Erreur : ") + err.message, "error");
   }
 }
 
@@ -162,7 +161,6 @@ window.submitChildCareModes = async function () {
     if (!res.success) throw new Error(res.error);
     if (window.showToast)
       showToast(tr("fc_child_saved") || "Sauvegardé !", "success");
-    else alert(tr("fc_child_saved") || "Sauvegardé !");
 
     const currentPerson = calGlobalData.people.find(
       (k) => parseInt(k.id) === window.currentSelectedMemberId,
@@ -171,7 +169,7 @@ window.submitChildCareModes = async function () {
       currentPerson.care_modes = JSON.stringify(selectedModes);
     }
   } catch (err) {
-    alert("Erreur: " + err.message);
+    showToast((tr("fc_error") || "Erreur : ") + err.message, "error");
   }
 };
 
@@ -254,12 +252,11 @@ function resetLeaveTypeForm() {
 }
 
 async function deleteLeaveType(code, label) {
-  if (
-    !confirm(
-      `Supprimer définitivement le congé "${label}" du catalogue ? Cela le retirera également des membres qui l'utilisent.`,
-    )
-  )
-    return;
+  const msg = (
+    tr("fc_confirm_del_catalog") ||
+    "Supprimer définitivement le congé %s du catalogue ?"
+  ).replace("%s", `"${label}"`);
+  if (!(await pachaConfirm(tr("btn_delete") || "Supprimer", msg))) return;
 
   const fd = new FormData();
   fd.append("action", "delete_leave_type");
@@ -280,7 +277,7 @@ async function deleteLeaveType(code, label) {
       loadMemberConfigView();
     }
   } catch (err) {
-    alert("Erreur de suppression : " + err.message);
+    showToast((tr("fc_error") || "Erreur : ") + err.message, "error");
   }
 }
 
@@ -290,10 +287,10 @@ async function saveLeaveType() {
   const carryMax = document.getElementById("lt-carry-max").value;
   const carryDeadline = document.getElementById("lt-carry-deadline").value;
 
-  if (!code || !label)
-    return window.showToast
-      ? showToast(tr("fc_err_code_label"), "error")
-      : alert(tr("fc_err_code_label"));
+  if (!code || !label) {
+    showToast(tr("fc_err_code_label"), "error");
+    return;
+  }
 
   const fd = new FormData();
   fd.append("action", "save_leave_type");
@@ -314,7 +311,7 @@ async function saveLeaveType() {
     resetLeaveTypeForm();
     loadLeaveCatalog();
   } catch (err) {
-    alert(tr("error_occured") + " " + err.message);
+    showToast((tr("fc_error") || "Erreur : ") + err.message, "error");
   }
 }
 
@@ -571,9 +568,11 @@ async function addMemberLeave(personId) {
   ).value;
 
   if (!leaveCode) {
-    return window.showToast
-      ? showToast("Veuillez sélectionner un type de congé", "error")
-      : alert("Veuillez sélectionner un type de congé");
+    showToast(
+      tr("fc_err_select_leave") || "Veuillez sélectionner un type de congé",
+      "error",
+    );
+    return;
   }
 
   const fd = new FormData();
@@ -597,17 +596,17 @@ async function addMemberLeave(personId) {
     if (window.showToast) showToast("Opération réussie !", "success");
     loadMemberConfigView();
   } catch (err) {
-    if (window.showToast) showToast("Erreur : " + err.message, "error");
-    else alert("Erreur: " + err.message);
+    showToast((tr("error_occured") || "Erreur : ") + err.message, "error");
   }
 }
 
 async function deleteMemberLeave(id, personId) {
   if (
-    !confirm(
-      tr("confirm_delete") ||
+    !(await pachaConfirm(
+      tr("btn_delete") || "Supprimer",
+      tr("fc_confirm_del_member_leave") ||
         "Voulez-vous vraiment retirer ce congé pour ce membre ?",
-    )
+    ))
   )
     return;
 
@@ -629,12 +628,7 @@ async function deleteMemberLeave(id, personId) {
       );
     loadMemberConfigView(); // Recharge la vue des attributions du membre
   } catch (err) {
-    if (window.showToast)
-      showToast(
-        (tr("error_occured") || "Erreur") + " : " + err.message,
-        "error",
-      );
-    else alert("Erreur: " + err.message);
+    showToast((tr("error_occured") || "Erreur : ") + err.message, "error");
   }
 }
 
@@ -2365,7 +2359,7 @@ document.addEventListener("DOMContentLoaded", () => {
 
             await this.refreshAllData(); // Recharge les graphiques en direct
           } catch (err) {
-            alert(tr("error_occured") + " " + err.message);
+            showToast((tr("fc_error") || "Erreur : ") + err.message, "error");
           } finally {
             if (btn) {
               btn.innerHTML = originalText;
@@ -2682,7 +2676,7 @@ document.addEventListener("DOMContentLoaded", () => {
         }
         await this.refreshAllData();
       } catch (e) {
-        alert("Erreur: " + e.message);
+        showToast((tr("error_occured") || "Erreur : ") + e.message, "error");
       }
     }
   }
diff --git a/modules/holidays/holidays.js b/modules/holidays/holidays.js
index 77e9594..3092db7 100644
--- a/modules/holidays/holidays.js
+++ b/modules/holidays/holidays.js
@@ -1190,9 +1190,7 @@ function openGlobalPlanningModal() {
   const holidayData = JSON.parse(holidayDataJsonEl.textContent).main;
 
   if (!holidayData.start_date || !holidayData.end_date) {
-    alert(
-      "Veuillez d'abord définir les dates globales du voyage dans 'Modifier les bases' ⚙️",
-    );
+    showToast(tr("hdl_js_missing_global_dates"), "error");
     return;
   }
 
@@ -1957,7 +1955,8 @@ async function addQuickTransitExpense(
       "/modules/holidays/includes/api/save_checkpoint.php",
       { method: "POST", body: fd },
     );
-    if (!data.success) alert("Erreur : " + data.error);
+    if (!data.success)
+      showToast((tr("error_occured") || "Erreur : ") + data.error, "error");
   } catch (err) {
     console.error(err);
   }
@@ -1977,7 +1976,7 @@ function updateFuelPrice() {
       localStorage.setItem("holidays_fuel_price", newPrice);
       window.location.reload();
     } else {
-      alert("Prix invalide.");
+      showToast(tr("hdl_invalid_price"), "error");
     }
   }
 }
@@ -2177,11 +2176,11 @@ async function deleteAttachment(fileId, btnElement) {
           '<p style="text-align: center; font-size: 0.85rem; color: var(--text-muted); font-style: italic;">Aucun document pour cette étape.</p>';
       }
     } else {
-      alert("Erreur : " + data.error);
+      showToast("Erreur : " + data.error, "error");
       row.style.opacity = "1";
     }
   } catch (err) {
-    alert("Erreur réseau lors de la suppression.");
+    showToast(tr("hdl_js_network_error"), "error");
     row.style.opacity = "1";
   }
 }
@@ -2194,7 +2193,7 @@ window.generateTravelBook = function () {
   const btn = document.querySelector('button[onclick="generateTravelBook()"]');
 
   if (!element) {
-    alert("Erreur : Le modèle de carnet de voyage est introuvable.");
+    showToast(tr("hdl_err_travel_book_missing"), "error");
     return;
   }