This change allows for easy customisation of the relation manager titles and toolbar buttons.
For buttons - define your custom strings directly in the standard `toolbarButtons` syntax...
```
toolbarButtons:
create: acme.blog::lang.subcategory.CreateButtonText
delete: # omit the string to fall back to the default button text
```
...and the old syntax still works...
```
toolbarButtons: create|delete
```
For titles - define different strings for each mode (form, list or pivot)...
```
title:
form: acme.blog::lang.subcategory.FormTitle
list: acme.blog::lang.subcategory.ListTitle
```
This feature provides developer convenience, for example in this situation where I have a relation manager that is used to assign user permissions to a project:
Before

After

This PR contains no breaking changes.
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|---|---|---|
| .. | ||
| importexportcontroller | ||
| listcontroller/partials | ||
| relationcontroller | ||
| reordercontroller | ||
| FormController.php | ||
| ImportExportController.php | ||
| ListController.php | ||
| RelationController.php | ||
| ReorderController.php | ||
| UserPreferencesModel.php | ||