OEL-1167: Place the language switcher block on the page content region.

modules/oe_whitelabel_multilingual/config/optional/block.block.openeuropa_content_language_switcher.yml

+langcode: en
+status: true
+dependencies:
+  module:
+    - oe_multilingual
+  theme:
+    - oe_whitelabel
+id: openeuropa_content_language_switcher
+theme: oe_whitelabel
+region: content
+weight: -4
+provider: null
+plugin: oe_multilingual_content_language_switcher
+settings:
+  id: oe_multilingual_content_language_switcher
+  label: 'OpenEuropa Content Language Switcher'
+  label_display: '0'
+  provider: oe_multilingual
+visibility: {  }