diff --git a/bedrock/cms/management/commands/run_smartling_sync.py b/bedrock/cms/management/commands/run_smartling_sync.py
index 9f8b339cf65..15beb235e04 100644
--- a/bedrock/cms/management/commands/run_smartling_sync.py
+++ b/bedrock/cms/management/commands/run_smartling_sync.py
@@ -29,6 +29,6 @@ def handle(self, *args, **kwargs):
             )
             if SMARTLING_SYNC_SNITCH_URL:
                 requests.get(SMARTLING_SYNC_SNITCH_URL)
-            sys.stdout.write("Snitch pinged\n")
+                sys.stdout.write("Snitch pinged\n")
         except Exception as ex:
             sys.stderr.write(f"\nsync_smartling did not execute successfully: {ex}\n")
diff --git a/bedrock/cms/models/base.py b/bedrock/cms/models/base.py
index 979a67d3d73..de28b537544 100644
--- a/bedrock/cms/models/base.py
+++ b/bedrock/cms/models/base.py
@@ -8,6 +8,7 @@
 from django.views.decorators.cache import never_cache
 
 from wagtail.models import Page as WagtailBasePage
+from wagtail_localize.fields import SynchronizedField
 
 from lib import l10n_utils
 
@@ -32,6 +33,13 @@ class AbstractBedrockCMSPage(WagtailBasePage):
         `serve_password_required_response` method, via the @method_decorator above
     """
 
+    # Make the `slug` field 'synchronised', so it automatically gets copied over to
+    # every localized variant of the page and shouldn't get sent for translation.
+    # See https://wagtail-localize.org/stable/how-to/field-configuration/
+    override_translatable_fields = [
+        SynchronizedField("slug"),
+    ]
+
     class Meta:
         abstract = True
 
diff --git a/bedrock/settings/base.py b/bedrock/settings/base.py
index 7884f155b30..4b01006f4b9 100644
--- a/bedrock/settings/base.py
+++ b/bedrock/settings/base.py
@@ -2101,14 +2101,21 @@ def before_send(event, hint):
 
 def lazy_wagtail_langs():
     enabled_wagtail_langs = [
-        ("en-US", "English"),
-        # TODO: expand to other locales supported by our translation vendor
-        # ("de", "Deutsch"),
-        ("fr", "Français"),
-        # ("es", "Español"),
-        # ("es", "Español mexicano"),
-        # ("it", "Italiano"),
-        # more to come
+        # Notes:
+        # 1) The labels are only used internally so can be in English
+        # 2) These are the Bedrock-side lang codes. They are mapped to
+        # Smartling-specific ones in the WAGTAIL_LOCALIZE_SMARTLING settings, below
+        ("en-US", "English (US)"),
+        ("de", "German"),
+        ("fr", "French"),
+        ("es-ES", "Spanish (Spain)"),
+        ("it", "Italian"),
+        ("ja", "Japanese"),
+        ("nl", "Dutch (Netherlands)"),
+        ("pl", "Polish"),
+        ("pt-BR", "Portuguese (Brazil)"),
+        ("ru", "Russian"),
+        ("zh-CN", "Chinese (China-Simplified)"),
     ]
     enabled_language_codes = [x[0] for x in LANGUAGES]
     retval = [wagtail_lang for wagtail_lang in enabled_wagtail_langs if wagtail_lang[0] in enabled_language_codes]
@@ -2144,6 +2151,16 @@ def lazy_wagtail_langs():
         default="5",
         parser=float,
     ),  # Timeout in seconds for requests to the Smartling API
+    "LOCALE_TO_SMARTLING_LOCALE": {
+        "de": "de-DE",
+        "fr": "fr-FR",
+        "it": "it-IT",
+        "ja": "ja-JP",
+        "nl": "nl-NL",
+        "pl": "pl-PL",
+        "ru": "ru-RU",
+    },
+    "REFORMAT_LANGUAGE_CODES": False,  # don't force language codes into Django's all-lowercase pattern
 }
 
 # Custom settings, not a core Wagtail ones, to scope out RichText options