feat(user): add certificate production tracking and update localization

- Introduced a new field `certificateProductionsCountSince` in the `FalukantUser` model to track the date from which production logs are counted for certificate requirements.
- Updated the `FalukantService` to utilize the new field for calculating completed productions since the specified date.
- Enhanced the UI to display the count of productions since the last promotion, with corresponding translations added for multiple languages including Cebuano, German, English, Spanish, and French.
- Implemented a method to delete old production logs, ensuring efficient data management while maintaining necessary historical records for certificate calculations.

frontend/src/views/falukant/OverviewView.vue

@@ -131,6 +131,16 @@
                         <div class="detail-list__item">
                             <span>{{ $t('falukant.overview.certificate.factor.completedProductions') }}</span>
                             <strong>{{ certificateProgress.currentValues.completedProductions }}</strong>
+                            <p
+                                v-if="certificateProgress.certificateProductionsCountSince"
+                                class="certificate-panel__productions-since"
+                            >
+                                {{
+                                    $t('falukant.overview.certificate.productionsSince', {
+                                        date: formatDate(certificateProgress.certificateProductionsCountSince),
+                                    })
+                                }}
+                            </p>
                         </div>
                         <div class="detail-list__item">
                             <span>{{ $t('falukant.overview.certificate.factor.reputation') }}</span>
@@ -907,6 +917,13 @@ export default {
     color: var(--color-text-secondary);
 }
 
+.certificate-panel__productions-since {
+    margin: 6px 0 0;
+    font-size: 0.85rem;
+    line-height: 1.35;
+    color: var(--color-text-secondary);
+}
+
 .certificate-panel__grid {
     display: grid;
     grid-template-columns: repeat(2, minmax(0, 1fr));