diff --git a/L10n/en.template b/L10n/en.template
index 11ed447a..0065c1e7 100644
--- a/L10n/en.template
+++ b/L10n/en.template
@@ -230,6 +230,12 @@
 /* Section heading in settings. [prefs.py] */
 "File location" = "File location";
 
+/* Failures to access Frontier CAPI endpoints [companion.py] */
+"Frontier CAPI query failure" = "Frontier CAPI query failure";
+
+/* Server errors from Frontier CAPI server [companion.py] */
+"Frontier CAPI server error" = "Frontier CAPI server error";
+
 /* CQC rank. [stats.py] */
 "Gladiator" = "Gladiator";
 
diff --git a/companion.py b/companion.py
index ca0a529c..953e5fb4 100644
--- a/companion.py
+++ b/companion.py
@@ -541,7 +541,7 @@ class Session(object):
 
         except Exception as e:
             logger.debug('Attempting GET', exc_info=e)
-            raise ServerError(f'unable to get endpoint {endpoint}') from e
+            raise ServerError(f'{_("Frontier CAPI query failure")}: {endpoint}') from e
 
         if r.url.startswith(SERVER_AUTH):
             logger.info('Redirected back to Auth Server')
@@ -556,7 +556,7 @@ class Session(object):
             # Server error. Typically 500 "Internal Server Error" if server is down
             logger.debug('500 status back from CAPI')
             self.dump(r)
-            raise ServerError(f'Received error {r.status_code} from server')
+            raise ServerError(f'{_("Frontier CAPI server error")}: {r.status_code}')
 
         try:
             r.raise_for_status()  # Typically 403 "Forbidden" on token expiry