diff --git a/README.md b/README.md
index 18797da..7363067 100644
--- a/README.md
+++ b/README.md
@@ -206,7 +206,7 @@ As moodle administrator, you can make the following settings:
     </tr>
     <tr>
         <th>HTML entities</th>
-        <td>If this setting is set to <code>true</code>, HTMLentities like "&", "<", etc. are supported within the JavaScript code for JSXGraph.</td>
+        <td>If this setting is set to <code>true</code>, HTML entities like "&", "<", etc. are supported within the JavaScript code for JSXGraph.</td>
     </tr>
     <tr>
         <th>convert encoding</th>
@@ -264,7 +264,7 @@ Within the `<jsxgraph>` tag different attributes can be declared, e.g. `<jsxgrap
     </tr>
     <tr>
         <th><code>entities</code></th>
-        <td>If HTMLentities like "&", "<", etc. should be supported within the JavaScript code set the attribute to <code>"true"</code>. To override a global <code>true</code> type <code>"false"</code>.</td>
+        <td>If HTML entities like "&", "<", etc. should be supported within the JavaScript code set the attribute to <code>"true"</code>. To override a global <code>true</code> type <code>"false"</code>.</td>
     </tr>
     <tr>
         <th><code>useGlobalJS</code></th>
diff --git a/filter.php b/filter.php
index 22a3357..4f8238d 100644
--- a/filter.php
+++ b/filter.php
@@ -370,7 +370,7 @@ private function apply_js($node) {
 
         // Convert the HTML-entities in the variable $code.
 
-        if ($this->settings['HTMLentities'] && $attributes['entities']) {
+        if ($this->settings['html_entities'] && $attributes['entities']) {
             $code = html_entity_decode($code);
         }
 
@@ -896,7 +896,7 @@ private function get_adminsettings() {
         $defaults = [
             'versionJSXGraph' => 'auto',
             'formulasextension' => true,
-            'HTMLentities' => true,
+            'html_entities' => true,
             'convertencoding' => true,
             'globalJS' => '',
             'usedivid' => false,
@@ -912,7 +912,7 @@ private function get_adminsettings() {
 
         $bools = [
             'formulasextension',
-            'HTMLentities',
+            'html_entities',
             'convertencoding',
             'usedivid',
         ];
diff --git a/lang/de/filter_jsxgraph.php b/lang/de/filter_jsxgraph.php
index 2dbc27c..c8110db 100644
--- a/lang/de/filter_jsxgraph.php
+++ b/lang/de/filter_jsxgraph.php
@@ -32,8 +32,6 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['filtername'] = 'JSXGraph';
-
 $string['aspectratio'] = 'Seitenverhältnis';
 $string['aspectratio_desc'] = 'Format z.B. <code>1 / 1</code>';
 
@@ -59,6 +57,8 @@
 $string['fallbackwidth'] = 'Fallback-Breite';
 $string['fallbackwidth_desc'] = 'Siehe Beschreibung der Standard-Dimensionen.';
 
+$string['filtername'] = 'JSXGraph';
+
 $string['filterversion'] = 'Sie benutzen derzeit die folgende <b>Version des JSXGraph-Filters</b> für Moodle:';
 
 $string['fixheight'] = 'Höhe';
@@ -81,8 +81,8 @@
 $string['header_libs'] = 'Erweiterungen für den JSXGraph-Filter';
 $string['header_versions'] = 'Versionsinformationen';
 
-$string['HTMLentities'] = 'HTMLentities';
-$string['HTMLentities_desc'] = 'Einstellung, ob HTMLentities wie z.B. "&", "<",... innerhalb des JavaScript-Codes für JSXGraph unterstützt werden.';
+$string['html_entities'] = 'HTML entities';
+$string['html_entities_desc'] = 'Einstellung, ob HTML entities wie z.B. "&", "<",... innerhalb des JavaScript-Codes für JSXGraph unterstützt werden.';
 
 $string['maxheight'] = 'Maximale Höhe';
 $string['maxheight_desc'] = '';
diff --git a/lang/en/filter_jsxgraph.php b/lang/en/filter_jsxgraph.php
index ebb339a..f0e3549 100644
--- a/lang/en/filter_jsxgraph.php
+++ b/lang/en/filter_jsxgraph.php
@@ -32,8 +32,6 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['filtername'] = 'JSXGraph';
-
 $string['aspectratio'] = 'aspect-ratio';
 $string['aspectratio_desc'] = 'Format e.g. <code>1 / 1</code>';
 
@@ -59,6 +57,8 @@
 $string['fallbackwidth'] = 'fallback width';
 $string['fallbackwidth_desc'] = 'See description of standard dimensions.';
 
+$string['filtername'] = 'JSXGraph';
+
 $string['filterversion'] = 'You are using version the following <b>version of the JSXGraph filter</b> for Moodle:';
 
 $string['fixheight'] = 'height';
@@ -81,8 +81,8 @@
 $string['header_libs'] = 'Extensions for the JSXGraph filter';
 $string['header_versions'] = 'Version info';
 
-$string['HTMLentities'] = 'HTML entities';
-$string['HTMLentities_desc'] = 'Decide whether HTMLentities like "&", "<",... are supported within the JavaScript code for JSXGraph.';
+$string['html_entities'] = 'HTML entities';
+$string['html_entities_desc'] = 'Decide whether HTML entities like "&", "<",... are supported within the JavaScript code for JSXGraph.';
 
 $string['maxheight'] = 'max-height';
 $string['maxheight_desc'] = '';
@@ -107,4 +107,4 @@
 $string['versionJSXGraph_auto'] = 'latest supplied version (automatically)';
 $string['versionJSXGraph_desc'] = 'Select here which version of JSXGraph should be used. Attention: Version 1.3.2+ is needed for responsiveness.';
 
-$string['yes'] = 'yes';
\ No newline at end of file
+$string['yes'] = 'yes';
diff --git a/settings.php b/settings.php
index fcb16fe..c15d186 100644
--- a/settings.php
+++ b/settings.php
@@ -153,9 +153,9 @@ function get_recommended_version_with_prefix() {
                    ));
 
     $settings->add(new admin_setting_configselect(
-                       'filter_jsxgraph/HTMLentities',
-                       get_string('HTMLentities', 'filter_jsxgraph'),
-                       get_string('HTMLentities_desc', 'filter_jsxgraph'),
+                       'filter_jsxgraph/html_entities',
+                       get_string('html_entities', 'filter_jsxgraph'),
+                       get_string('html_entities_desc', 'filter_jsxgraph'),
                        '1',
                        [get_string('no', 'filter_jsxgraph'), get_string('yes', 'filter_jsxgraph')]
                    ));