Since RUNTIME-269, <LabelKey> has been transformed into <label i18n="true"> for configuration parameter.
In order to use the same syntax, the following definitions must be modified:

• org.ametys.runtime.ui.item.UIItemManager extension:

  <extension  point="org.ametys.runtime.ui.item.UIItemManager"  ...>
    ...
    <LabelKey>PLUGINS_CORE_ADMINISTRATOR_PASSWORD_LABEL</LabelKey>
    <DescriptionKey>PLUGINS_CORE_ADMINISTRATOR_PASSWORD_DESCRIPTION</DescriptionKey>
  

• org.ametys.runtime.plugins.core.right.RightsExtensionPoin extension:

  <extension point="org.ametys.runtime.plugins.core.right.RightsExtensionPoint" ...>
    <right id="Runtime_Rights_User_Handle">
    <label>PLUGINS_CORE_USERS_RIGHTS_HANDLE_LABEL</label>
    <description>PLUGINS_CORE_USERS_RIGHTS_HANDLE_DESCRIPTION</description>
    <category>PLUGINS_CORE_USERANDRIGHTS_CATEGORY</category>
     ...
  

Moreover, this kind of definition can have their own schema, thanks to RUNTIME-268.