[5.1] add language deprecation for #37320

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#42584 Here are the upstream changes:

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diff --git a/administrator/language/en-GB/com_fields.ini b/administrator/language/en-GB/com_fields.ini
index d2f141ab70b13..1799bf0d9d165 100644
--- a/administrator/language/en-GB/com_fields.ini
+++ b/administrator/language/en-GB/com_fields.ini
@@ -21,6 +21,8 @@ COM_FIELDS_FIELD_EDITABLE_IN_BOTH="Both"
 COM_FIELDS_FIELD_EDITABLE_IN_LABEL="Editable In"
 COM_FIELDS_FIELD_EDITABLE_IN_SITE="Site"
 COM_FIELDS_FIELD_FORM_EDIT="Edit Field"
+; The following string is deprecated and will be removed with 6.0
+COM_FIELDS_FIELD_FORM_LAYOUT_LABEL="Layout"
 COM_FIELDS_FIELD_FORM_NEW="New Field"
 COM_FIELDS_FIELD_FORMOPTIONS_HEADING="Form Options"
 COM_FIELDS_FIELD_GROUP_LABEL="Field Group"
diff --git a/administrator/language/en-GB/plg_fields_list.ini b/administrator/language/en-GB/plg_fields_list.ini
index f3b4e535323f2..e71aa23ad5f68 100644
--- a/administrator/language/en-GB/plg_fields_list.ini
+++ b/administrator/language/en-GB/plg_fields_list.ini
@@ -5,6 +5,8 @@
 
 PLG_FIELDS_LIST="Fields - List"
 PLG_FIELDS_LIST_LABEL="List (%s)"
+; The following string is deprecated and will be removed with 6.0
+PLG_FIELDS_LIST_PARAMS_FORM_LAYOUT_FANCY_SELECT="Enhanced select"
 PLG_FIELDS_LIST_PARAMS_MULTIPLE_LABEL="Multiple"
 PLG_FIELDS_LIST_PARAMS_OPTIONS_LABEL="List Values"
 PLG_FIELDS_LIST_PARAMS_OPTIONS_NAME_LABEL="Text"
diff --git a/administrator/language/en-GB/plg_fields_sql.ini b/administrator/language/en-GB/plg_fields_sql.ini
index 69403cdbc53c5..0354e65bde29b 100644
--- a/administrator/language/en-GB/plg_fields_sql.ini
+++ b/administrator/language/en-GB/plg_fields_sql.ini
@@ -6,6 +6,8 @@
 PLG_FIELDS_SQL="Fields - SQL"
 PLG_FIELDS_SQL_CREATE_NOT_POSSIBLE="Only a Super User can create or edit an SQL field!"
 PLG_FIELDS_SQL_LABEL="SQL (%s)"
+; The following string is deprecated and will be removed with 6.0
+PLG_FIELDS_SQL_PARAMS_FORM_LAYOUT_FANCY_SELECT="Enhanced select"
 PLG_FIELDS_SQL_PARAMS_HEADER_DESC="Add a string with no value at the top of the dropdown list eg ' - Select Article - '."
 PLG_FIELDS_SQL_PARAMS_HEADER_LABEL="Header"
 PLG_FIELDS_SQL_PARAMS_MULTIPLE_LABEL="Multiple"
diff --git a/plugins/fields/subform/params/subform.xml b/plugins/fields/subform/params/subform.xml
index b9edc0187af98..de8264800355a 100644
--- a/plugins/fields/subform/params/subform.xml
+++ b/plugins/fields/subform/params/subform.xml
@@ -67,7 +67,7 @@
 				<field
 					name="form_layout"
 					type="list"
-					label="COM_FIELDS_FIELD_FORM_LAYOUT_LABEL"
+					label="JLIB_FORM_FIELD_PARAM_LAYOUT_LABEL"
 					default=""
 					class="form-select"
 					showon="repeat:1"