Fix text box vertex style

lang/es/home.php

@@ -245,6 +245,7 @@ Tenemos traducciones en griego 🇬🇷.</a> <a href=\"https://github.com/UnickS
     $g_lang['squere'] = "Square";
     $g_lang['triangle'] = "Triangle";
     $g_lang['pentagon'] = "Pentagon";
+    $g_lang['textbox'] = "Textbox";
     $g_lang['vertex_diameter'] = "Vertex size";
 
     $g_lang['additional_text_color'] = "Another text color";