Give a hint about optimizing all presets

ftl/core/deck-config.ftl

@@ -350,6 +350,7 @@ deck-config-compute-optimal-weights = Optimize FSRS parameters
 deck-config-compute-optimal-retention = Compute optimal retention
 deck-config-optimize-button = Optimize
 deck-config-compute-button = Compute
+deck-config-optimize-all-tip = You can optimize all presets at once by using the button at the top.
 deck-config-evaluate-button = Evaluate
 deck-config-desired-retention = Desired retention
 deck-config-sm2-retention = SM2 retention

ts/deck-options/FsrsOptions.svelte

@@ -310,6 +310,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         {#if computingWeights || checkingWeights}<div>
                 {computeWeightsProgressString}
             </div>{/if}
+
+        <div>{tr.deckConfigOptimizeAllTip()}</div>
     </details>
 </div>