fix(i18n): update help text to reflect live preview

- Preview updates automatically as you type
- Ctrl+Enter triggers immediate validation, not required for basic use

src/index.html

@@ -149,7 +149,7 @@
 					<ol>
 						<li data-i18n="completingStep1">Read the task instructions on the left</li>
 						<li data-i18n="completingStep2">Write your code in the editor</li>
-						<li data-i18n-html="completingStep3">Click <strong>Run</strong> or press <kbd>Ctrl+Enter</kbd> to test</li>
+						<li data-i18n="completingStep3">Watch the live preview update as you type</li>
 						<li data-i18n="completingStep4">Follow hints to fix any issues</li>
 						<li data-i18n-html="completingStep5">Click <strong>Next</strong> when complete</li>
 					</ol>
@@ -163,7 +163,7 @@
 
 					<h4 data-i18n="keyboardShortcutsTitle">Keyboard Shortcuts</h4>
 					<ul>
-						<li data-i18n-html="shortcutRun"><kbd>Ctrl+Enter</kbd> - Run your code</li>
+						<li data-i18n-html="shortcutRun"><kbd>Ctrl+Enter</kbd> - Validate immediately</li>
 						<li data-i18n-html="shortcutUndo"><kbd>Ctrl+Z</kbd> - Undo</li>
 						<li data-i18n-html="shortcutRedo"><kbd>Ctrl+Shift+Z</kbd> - Redo</li>
 					</ul>