Localized Values 

Format Values in Twig 

Use localized_value twig filter

{# mytwig.html.twig #}
localization.titles|localized_value

Format Values in Layout Configs 

Use locale layout data provider and getLocalizedValue().

…/Resources/views/layouts/…/myconfig.yml 
 layout:
     actions:
         - '@add':
             ...
             options:
                 ...
                 content: '=data["locale"].getLocalizedValue(data["localization"].getTitles())'

Format Values in Datagrids 

Use datagrid property with type localized_value and attribute data_name to set the required property by path, for example titles, relation.subrelation.titles. If the current localization is not detected, SQL relation will be joined to the default fallback values. Otherwise, it will be received by LocalizationHelper; sorters and filters will be removed.

…/Resources/config/oro/datagrids.yml 
 datagrids:
     my-localizations-grid:
         source:
             type: orm
             query:
                 select:
                     - l.id
                     - l.name
                 from:
                     - { table: Oro\Bundle\LocaleBundle\Entity\Localization, alias: l }
         properties:
             title:
                 type: localized_value # property type
                 data_name: titles # property path to localized property of an entity
         columns:
             name:
                 label: Name
             title:
                 label: Title
         sorters:
             columns:
                 name:
                     data_name: name
                 title:
                     data_name: title
         filters:
             columns:
                 name:
                     type: string
                     data_name: name
                 title:
                     type: string
                     data_name: title