fix rsbackend compat issues

pylib/anki/lang.py

@@ -14,8 +14,6 @@ import anki._backend.fluent_pb2 as _fluent_pb
 # public exports
 TR = _fluent_pb.FluentString
 FormatTimeSpan = _pb.FormatTimespanIn
-# legacy alias used by add-ons
-FormatTimeSpanContext = FormatTimeSpan
 
 langs = sorted(
     [

pylib/anki/rsbackend.py

@@ -9,4 +9,6 @@
 
 from anki.decks import DeckTreeNode
 from anki.errors import InvalidInput, NotFoundError
-from anki.lang import FormatTimeSpan
+from anki.lang import TR
+from anki.lang import FormatTimeSpan as FormatTimeSpanContext
+from anki.utils import from_json_bytes, to_json_bytes

qt/aqt/pinnedmodules.py

@@ -34,6 +34,7 @@ import pyaudio
 # legacy compat
 import anki.storage
 import anki.sync
+import anki.rsbackend
 
 # platform-specifics
 from anki.utils import isLin, isMac, isWin