diff --git a/.husky/pre-commit b/.husky/pre-commit
index 5ee7abd87c..6aa13dae08 100755
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -1 +1 @@
-pnpm exec lint-staged
+pnpm exec lint-staged --no-revert
diff --git a/.lintstagedrc b/.lintstagedrc
index a0b7c06eb7..c1b609d560 100644
--- a/.lintstagedrc
+++ b/.lintstagedrc
@@ -1,5 +1,7 @@
 {
   "*.{ts,tsx}": ["pnpm exec eslint --fix", "bash -c 'pnpm exec tsc --noEmit'"],
   "*.{ts,tsx,jsonc,md}": ["pnpm exec prettier --write"],
-  "*.php": ["./vendor/bin/phpstan analyze --memory-limit=-1"]
+  "*.php": [
+    "bash -c 'if [ ! -x ./vendor/bin/phpstan ]; then printf \"\\nError: PHPStan is not installed.\\n\\nInstall it with:\\n  composer install\\n\\nThen retry your commit.\\n\\n\" >&2; exit 1; fi; exec ./vendor/bin/phpstan analyze --memory-limit=-1 \"$@\"' --"
+  ]
 }
diff --git a/assets/core/scss/components/_calendar.scss b/assets/core/scss/components/_calendar.scss
index 582d018da2..768187826d 100644
--- a/assets/core/scss/components/_calendar.scss
+++ b/assets/core/scss/components/_calendar.scss
@@ -94,8 +94,8 @@
 }
 
 .tutor-range-calendar-popover {
-  width: 700px;
-  max-width: 700px;
+  min-width: 700px;
+  max-width: 750px;
 
   @include tutor-breakpoint-down(md) {
     width: 300px;
diff --git a/assets/core/ts/index.ts b/assets/core/ts/index.ts
index fdb3b7219a..1e30ef041a 100644
--- a/assets/core/ts/index.ts
+++ b/assets/core/ts/index.ts
@@ -1,5 +1,6 @@
 import collapse from '@alpinejs/collapse';
 import focus from '@alpinejs/focus';
+import { setLocaleData } from '@wordpress/i18n';
 import Alpine from 'alpinejs';
 
 import { TutorComponentRegistry } from '@Core/ts/ComponentRegistry';
@@ -75,11 +76,16 @@ const initializePlugin = async () => {
   });
 
   TutorComponentRegistry.registerLazy({
-    calendar: () =>
-      import(
+    calendar: () => {
+      if (tutorConfig.calendar_locales) {
+        setLocaleData(tutorConfig.calendar_locales, 'tutor');
+      }
+
+      return import(
         /* webpackChunkName: "tutor-calendar" */
         '@Core/ts/components/calendar'
-      ).then(({ calendarMeta }) => calendarMeta),
+      ).then(({ calendarMeta }) => calendarMeta);
+    },
 
     form: () =>
       import(
diff --git a/classes/Assets.php b/classes/Assets.php
index ef7a97a588..63cf28ca78 100644
--- a/classes/Assets.php
+++ b/classes/Assets.php
@@ -374,6 +374,9 @@ public function modify_localize_data( $localize_data ) {
 				}
 			}
 		} else {
+			if ( 'en_US' !== $localize_data['local'] ) {
+				$localize_data['calendar_locales'] = tutils()->get_script_locale_data( 'tutor-calendar', $localize_data['local'] );
+			}
 
 			// Assign quiz option.
 			if ( ! empty( $post->post_type ) && 'tutor_quiz' === $post->post_type ) {
diff --git a/classes/User.php b/classes/User.php
index caed749f16..141fe08c6e 100644
--- a/classes/User.php
+++ b/classes/User.php
@@ -800,6 +800,7 @@ public function ajax_switch_profile() {
 		}
 
 		$switch_mode  = '';
+		$switch_label = '';
 		$current_mode = Input::post( 'current_mode' );
 
 		if ( ! in_array( $current_mode, array( self::VIEW_AS_INSTRUCTOR, self::VIEW_AS_STUDENT ), true ) ) {
@@ -807,15 +808,17 @@ public function ajax_switch_profile() {
 		}
 
 		if ( self::VIEW_AS_INSTRUCTOR === $current_mode ) {
-			$switch_mode = self::VIEW_AS_STUDENT;
+			$switch_mode  = self::VIEW_AS_STUDENT;
+			$switch_label = __( 'Student', 'tutor' );
 		} elseif ( self::VIEW_AS_STUDENT === $current_mode ) {
-			$switch_mode = self::VIEW_AS_INSTRUCTOR;
+			$switch_mode  = self::VIEW_AS_INSTRUCTOR;
+			$switch_label = __( 'Instructor', 'tutor' );
 		}
 
 		update_user_meta( $user_id, self::VIEW_MODE_USER_META, $switch_mode );
 
 		// translators:%s for switching mode.
-		$this->response_success( sprintf( __( 'Profile switched to %s!', 'tutor' ), $switch_mode ) );
+		$this->response_success( sprintf( __( 'Profile switched to %s!', 'tutor' ), $switch_label ) );
 	}
 
 	/**
diff --git a/readme.txt b/readme.txt
index 33de9df212..4739a56fdb 100644
--- a/readme.txt
+++ b/readme.txt
@@ -5,7 +5,7 @@ Tags: lms, course, elearning, education, learning management system
 Requires at least: 5.3
 Tested up to: 7.0
 Requires PHP: 7.4
-Stable tag: 4.0.3
+Stable tag: 4.0.4
 License: GPLv3
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
 
@@ -338,6 +338,13 @@ Tutor LMS allows you to offer certificates to your students upon course completi
 
 == Changelog ==
 
+= 4.0.4 - 31 July, 2026
+
+Fix: Resolved the dark theme compatibility issue in the Course Builder.
+Fix: Added translation support for some previously untranslatable strings.
+Fix: Fixed the incorrect update notification in Tutor LMS Pro. (Pro)
+Fix: Prevented certificates from appearing for courses with no assigned certificate. (Pro)
+
 = 4.0.3 - 24 July, 2026
 
 Fix: Resolved an issue where quiz submissions failed in Legacy Mode.
diff --git a/templates/dashboard/account/billing/order-history.php b/templates/dashboard/account/billing/order-history.php
index 0b87d6ee12..ef0035eae5 100644
--- a/templates/dashboard/account/billing/order-history.php
+++ b/templates/dashboard/account/billing/order-history.php
@@ -89,7 +89,7 @@
 <?php
 if ( empty( $orders ) ) :
 	EmptyState::make()
-		->title( 'No Orders Found!' )
+		->title( __( 'No Orders Found!', 'tutor' ) )
 		->icon( tutor_utils()->get_themed_svg( 'images/illustrations/order-empty.svg' ) )
 		->render();
 else :
diff --git a/templates/dashboard/discussions/comment-list.php b/templates/dashboard/discussions/comment-list.php
index 1fd1506977..e0d3e0f047 100644
--- a/templates/dashboard/discussions/comment-list.php
+++ b/templates/dashboard/discussions/comment-list.php
@@ -105,7 +105,7 @@
 <?php if ( empty( $lesson_comments ) ) : ?>
 	<?php
 		EmptyState::make()
-			->title( 'No Comments Found!' )
+			->title( __( 'No Comments Found!', 'tutor' ) )
 			->icon( tutor_utils()->get_themed_svg( 'images/illustrations/comments-empty.svg' ) )
 			->render();
 	?>
diff --git a/templates/dashboard/discussions/qna-list.php b/templates/dashboard/discussions/qna-list.php
index bc62a7b8fe..1bd9023956 100644
--- a/templates/dashboard/discussions/qna-list.php
+++ b/templates/dashboard/discussions/qna-list.php
@@ -77,7 +77,7 @@
 <?php if ( empty( $questions ) ) : ?>
 	<?php
 		EmptyState::make()
-			->title( 'No Questions Found!' )
+			->title( __( 'No Questions Found!', 'tutor' ) )
 			->icon( tutor_utils()->get_themed_svg( 'images/illustrations/qna-empty.svg' ) )
 			->render();
 	?>
diff --git a/templates/dashboard/instructor/logged-in.php b/templates/dashboard/instructor/logged-in.php
index 499a643d4b..cacf1eac49 100644
--- a/templates/dashboard/instructor/logged-in.php
+++ b/templates/dashboard/instructor/logged-in.php
@@ -18,7 +18,7 @@
 
 if ( 'try_again' === $instructor_status ) {
 	Alert::make()
-		->text( 'You have been rejected from being an instructor.' )
+		->text( __( 'You have been rejected from being an instructor.', 'tutor' ) )
 		->variant( Alert::WARNING )
 		->icon( Icon::WARNING )
 		->render();
@@ -34,11 +34,11 @@
 				<?php
 				$instructor_status_text = '';
 				if ( 'pending' === $instructor_status ) {
-					$instructor_status_text = 'Your application will be reviewed and the results will be sent to you by email.';
+					$instructor_status_text = __( 'Your application will be reviewed and the results will be sent to you by email.', 'tutor' );
 				} elseif ( 'approved' === $instructor_status ) {
-					$instructor_status_text = 'Your application has been accepted. Further necessary details have been sent to your registered email account.';
+					$instructor_status_text = __( 'Your application has been accepted. Further necessary details have been sent to your registered email account.', 'tutor' );
 				} elseif ( 'blocked' === $instructor_status ) {
-					$instructor_status_text = 'You have been blocked from being an instructor.';
+					$instructor_status_text = __( 'You have been blocked from being an instructor.', 'tutor' );
 				}
 				Alert::make()
 					->text( $instructor_status_text )
diff --git a/templates/dashboard/my-courses.php b/templates/dashboard/my-courses.php
index d60020c68a..fdc4f2d65f 100644
--- a/templates/dashboard/my-courses.php
+++ b/templates/dashboard/my-courses.php
@@ -155,7 +155,7 @@ class="tutor-btn tutor-btn-primary tutor-btn-small tutor-gap-2"
 		<?php if ( empty( $results ) ) : ?>
 			<?php
 				EmptyState::make()
-					->title( 'No Courses Found' )
+					->title( __( 'No Courses Found', 'tutor' ) )
 					->icon( tutor_utils()->get_themed_svg( 'images/illustrations/learning-empty.svg' ) )
 					->render();
 			?>
diff --git a/templates/learning-area/lesson/comments.php b/templates/learning-area/lesson/comments.php
index db1dd9d9bd..b5fb21436a 100644
--- a/templates/learning-area/lesson/comments.php
+++ b/templates/learning-area/lesson/comments.php
@@ -105,8 +105,8 @@ class="tutor-flex tutor-items-center tutor-justify-between tutor-px-6 tutor-py-5
 	<?php
 	ConfirmationModal::make()
 		->id( 'delete-comment-modal' )
-		->title( 'Delete This Item?' )
-		->message( 'This action cannot be undone.' )
+		->title( __( 'Delete This Item?', 'tutor' ) )
+		->message( __( 'This action cannot be undone.', 'tutor' ) )
 		->icon( Icon::DELETE_2, 80 )
 		->mutation_state( 'deleteCommentMutation' )
 		->confirm_handler( 'deleteCommentMutation?.mutate({ comment_id: payload?.commentId })' )
diff --git a/templates/learning-area/subpages/qna.php b/templates/learning-area/subpages/qna.php
index 0d50cc90e2..cbadff076b 100644
--- a/templates/learning-area/subpages/qna.php
+++ b/templates/learning-area/subpages/qna.php
@@ -117,7 +117,7 @@
 		<?php if ( empty( $questions ) ) : ?>
 			<?php
 				EmptyState::make()
-					->title( 'No Questions Found!' )
+					->title( __( 'No Questions Found!', 'tutor' ) )
 					->icon( tutor_utils()->get_themed_svg( 'images/illustrations/qna-empty.svg' ) )
 					->render();
 			?>
diff --git a/tutor.php b/tutor.php
index 3c4dc04008..73a80b0cf1 100644
--- a/tutor.php
+++ b/tutor.php
@@ -4,7 +4,7 @@
  * Plugin URI: https://tutorlms.com
  * Description: Build and manage professional online courses with unlimited lessons, a flexible quiz engine, and a complete student learning experience. No coding needed.
  * Author: Themeum
- * Version: 4.0.3
+ * Version: 4.0.4
  * Author URI: https://themeum.com
  * Requires PHP: 7.4
  * Requires at least: 5.3
@@ -26,7 +26,7 @@
  *
  * @since 1.0.0
  */
-define( 'TUTOR_VERSION', '4.0.3' );
+define( 'TUTOR_VERSION', '4.0.4' );
 define( 'TUTOR_FILE', __FILE__ );
 define( 'TUTOR_ENV', 'PROD' ); // DEV || PROD.
 
diff --git a/views/pages/course-builder.php b/views/pages/course-builder.php
index 6107bffaba..81489cf567 100644
--- a/views/pages/course-builder.php
+++ b/views/pages/course-builder.php
@@ -31,7 +31,7 @@
 
 	<?php wp_head(); ?>
 </head>
-<body <?php body_class(); ?>>
+<body data-tutor-theme='light' <?php body_class(); ?>>
 	<div id="tutor-course-builder"></div>
 	<?php do_action( 'tutor_course_builder_footer' ); ?>
 	<?php wp_footer(); ?>