Fix : bad character into categories lang

Probably due to my table neighbor who constantly moving during devcamp ^^

htdocs/langs/en_US/categories.lang

@@ -66,7 +66,7 @@ ReturnInCompany=Back to customer/prospect card
 ContentsVisibleByAll=The contents will be visible by all
 ContentsVisibleByAllShort=Contents visible by all
 ContentsNotVisibleByAllShort=Contents not visible by all
-CategoriesTree=Categories tree²
+CategoriesTree=Categories tree
 DeleteCategory=Delete category
 ConfirmDeleteCategory=Are you sure you want to delete this category ?
 RemoveFromCategory=Remove link with categorie
@@ -110,4 +110,4 @@ ConfirmDeletePicture=Confirm picture deletion?
 ExtraFieldsCategories=Complementary attributes
 CategoriesSetup=Categories setup
 CategorieRecursiv=Link with parent category automatically
-CategorieRecursivHelp=If activated, product will also linked to parent category when adding into a subcategory
\ No newline at end of file
+CategorieRecursivHelp=If activated, product will also linked to parent category when adding into a subcategory