fix(admin): Translations table — add Section header column (was shifted 1 cell left)

- Table had 4 headers (Key + 3 langs) but 5 data cells (Section rowSpan + Key + 3 langs)
- Headers were misaligned relative to data; added Section column header

admin-next/src/components/locales/locales-page.tsx

@@ -214,6 +214,7 @@ export function LocalesPage() {
             <Table>
               <TableHeader>
                 <TableRow>
+                  <TableHead className="w-40">Section</TableHead>
                   <TableHead className="w-48">Key</TableHead>
                   {LANGS.map((lang) => (
                     <TableHead key={lang} className="w-48">