fix(tournament): update PDF title for missing data report

- Changed the PDF title in the TournamentPlacementsTab component to reflect the top 3 participants instead of a generic missing data title.
- This update enhances clarity in the generated PDF reports for users.

frontend/src/components/tournament/TournamentPlacementsTab.vue

@@ -782,7 +782,7 @@ export default {
                     pdf.setFontSize(8);
                     pdf.setTextColor(150);
                     pdf.text(
-                        `${t('tournaments.missingDataPDFTitle')} – ${new Date().toLocaleDateString('de-DE')} – ${t('tournaments.page')} ${i}/${pageCount}`,
+                        `${t('tournaments.missingDataPDFTitleTop3')} – ${new Date().toLocaleDateString('de-DE')} – ${t('tournaments.page')} ${i}/${pageCount}`,
                         margin,
                         200
                     );