docs(settings): drop four explanatory paragraphs

Text only — every feature stays exactly as it was.

  gen.mwDesc     what a Most Wanted rank is
  bk.hintMysql   what the on-close backup does with a MySQL logbook
  db.profileHint that the logbook follows the active profile
  db.mysqlHint   that several OpsLogs on one MySQL see each other live

They explained things an operator already knows, in a settings panel that has
plenty to read as it is. The backup header keeps its ordinary hint; only the
longer MySQL variant goes.

Each removed from BOTH dictionaries: a string left in one and dropped from the
other shows the bare key in the other language, which is what
TestEveryStringIsInBothLanguages exists to catch — and it passes.

frontend/src/components/SettingsModal.tsx

@@ -4743,7 +4743,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
       <>
         <SectionHeader
           title={t('sec.backup')}
-          hint={mysqlCfg.enabled ? t('bk.hintMysql') : t('bk.hint')}
+          hint={t('bk.hint')}
         />
         <div className="space-y-5 max-w-2xl">
           <label className="flex items-center gap-2 text-sm cursor-pointer">
@@ -5695,7 +5695,6 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
             </SelectContent>
           </Select>
         </div>
-        <p className="text-[11px] text-muted-foreground max-w-2xl mb-3">{t('db.profileHint')}</p>
 
         {/* Compact active-backend confirmation / MySQL-fallback warning. */}
         {backendStatus && (
@@ -5736,7 +5735,6 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
         {/* MySQL: shared logbook connection (multi-operator) */}
         {mysqlCfg.enabled && (
         <div className="space-y-3 max-w-2xl">
-          <div className="text-[11px] text-muted-foreground leading-relaxed">{t('db.mysqlHint')}</div>
           <div className="grid grid-cols-[130px_1fr] gap-2 items-center">
             <Label className="text-sm">{t('db.host')}</Label>
             <Input className="h-8" placeholder="192.168.1.10 or db.example.com" value={mysqlCfg.host} onChange={(e) => setMysqlField({ host: e.target.value })} />
@@ -6227,12 +6225,8 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
                 }}
                 className="mt-0.5"
               />
-              <span>
-                {t('gen.mwShow')}
-                <span className="block text-xs text-muted-foreground mt-0.5">
-                  {t('gen.mwDesc')}
-                </span>
-              </span>
+              {/* No explanatory line: every operator knows what Most Wanted is. */}
+              <span>{t('gen.mwShow')}</span>
             </label>
             <div className="flex items-center gap-3 pl-6">
               <Button variant="outline" size="sm" className="h-8" disabled={mwBusy}