fix(i18n): update last training filter hint across multiple languages

- Revised the lastTrainingFilterHint in localization files for German, English (AU, GB, US), and Swiss German to enhance clarity regarding the age-class column and details available on row hover.
- Improved consistency in terminology across different language files to ensure a better user experience.

frontend/src/i18n/locales/de-CH.json

@@ -476,7 +476,7 @@
     "lastTrainingFilterHasDate": "Mit erfasstem Datum",
     "lastTrainingFilterNoDate": "Ohne letztes Training",
     "lastTrainingFilterNotInTraining": "„Nicht mehr im Training“",
-    "lastTrainingFilterHint": "In der Tabelle: aktuelle Saison in der AK-Spalte. Alle Details (beide Saisons, letztes Training, ggf. Teilnahmen) beim Überfahren der Zeile.",
+    "lastTrainingFilterHint": "AK-Spalte: laufende und nächste Saison. Weitere Details (letztes Training, Teilnahmen) auch beim Überfahren der Zeile.",
     "rowTooltipSeparator": "·",
     "ttAgeClassCol": "AK (TT)",
     "ttAdult": "Erwachsene (kein Jugend nach Stichtag)",

frontend/src/i18n/locales/de.json

@@ -251,7 +251,7 @@
     "lastTrainingFilterHasDate": "Mit erfasstem Datum",
     "lastTrainingFilterNoDate": "Ohne letztes Training",
     "lastTrainingFilterNotInTraining": "„Nicht mehr im Training“",
-    "lastTrainingFilterHint": "In der Tabelle: aktuelle Saison in der AK-Spalte. Alle Details (beide Saisons, letztes Training, ggf. Teilnahmen) beim Überfahren der Zeile.",
+    "lastTrainingFilterHint": "AK-Spalte: laufende und nächste Saison. Weitere Details (letztes Training, Teilnahmen) auch beim Überfahren der Zeile.",
     "rowTooltipSeparator": "·",
     "ttAgeClassCol": "AK (TT)",
     "ttAdult": "Erwachsene (kein Jugend nach Stichtag)",

frontend/src/i18n/locales/en-AU.json

@@ -476,7 +476,7 @@
     "lastTrainingFilterHasDate": "With a recorded date",
     "lastTrainingFilterNoDate": "No last training",
     "lastTrainingFilterNotInTraining": "Flagged “no longer training”",
-    "lastTrainingFilterHint": "Table: current season in the age-class column. Full detail (both seasons, last training, participations if known) on row hover.",
+    "lastTrainingFilterHint": "Age-class column: current and next season. Extra detail (last training, participations) on row hover.",
     "rowTooltipSeparator": "·",
     "ttAgeClassCol": "Age class (TT)",
     "ttAdult": "Adults (not youth by cutoff)",

frontend/src/i18n/locales/en-GB.json

@@ -751,7 +751,7 @@
     "lastTrainingFilterHasDate": "With a recorded date",
     "lastTrainingFilterNoDate": "No last training",
     "lastTrainingFilterNotInTraining": "Flagged “no longer training”",
-    "lastTrainingFilterHint": "Table: current season in the age-class column. Full detail (both seasons, last training, participations if known) on row hover.",
+    "lastTrainingFilterHint": "Age-class column: current and next season. Extra detail (last training, participations) on row hover.",
     "rowTooltipSeparator": "·",
     "ttAgeClassCol": "Age class (TT)",
     "ttAdult": "Adults (not youth by cutoff)",

frontend/src/i18n/locales/en-US.json

@@ -476,7 +476,7 @@
     "lastTrainingFilterHasDate": "With a recorded date",
     "lastTrainingFilterNoDate": "No last training",
     "lastTrainingFilterNotInTraining": "Flagged “no longer training”",
-    "lastTrainingFilterHint": "Table: current season in the age-class column. Full detail (both seasons, last training, participations if known) on row hover.",
+    "lastTrainingFilterHint": "Age-class column: current and next season. Extra detail (last training, participations) on row hover.",
     "rowTooltipSeparator": "·",
     "ttAgeClassCol": "Age class (TT)",
     "ttAdult": "Adults (not youth by cutoff)",

frontend/src/views/MembersView.vue

@@ -431,7 +431,14 @@
                             <td>{{ getFormattedBirthdate(member.birthDate) }}</td>
                             <td>{{ getAgeLabel(member.birthDate) }}</td>
                             <td class="tt-age-class-cell">
-                                <span class="tt-age-class-compact">{{ formatMemberTtAgeClassCompactLine(member) }}</span>
+                                <div
+                                    v-for="(line, idx) in formatMemberTtAgeClassLines(member)"
+                                    :key="idx"
+                                    class="tt-age-class-line"
+                                    :class="{ 'tt-age-class-line--next': idx === 1 }"
+                                >
+                                    {{ line }}
+                                </div>
                             </td>
                             <td class="last-training-cell">
                                 <span class="last-training-compact">{{ getOptionalFormattedDate(member.lastTraining, 'members.previewNoLastTraining') }}</span>
@@ -2442,10 +2449,6 @@ export default {
             const d = new Date(member.lastTraining);
             return !Number.isNaN(d.getTime());
         },
-        formatMemberTtAgeClassCompactLine(member) {
-            const lines = this.formatMemberTtAgeClassLines(member);
-            return lines[0] || '–';
-        },
         memberRowHoverTooltip(member) {
             const akFull = this.formatMemberTtAgeClassLines(member).join(` ${this.$t('members.rowTooltipSeparator')} `);
             const dateLabel = this.$t('members.previewLastTraining');
@@ -3424,11 +3427,13 @@ table td {
     max-width: 11rem;
 }
 
-.tt-age-class-compact {
-    display: block;
-    overflow: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
+.tt-age-class-line + .tt-age-class-line {
+    margin-top: 0.2rem;
+}
+
+.tt-age-class-line--next {
+    opacity: 0.88;
+    font-size: 0.92em;
 }
 
 .last-training-cell {