diff --git a/third_party/2and3/polib.pyi b/third_party/2and3/polib.pyi
new file mode 100644
index 000000000..267e47e22
--- /dev/null
+++ b/third_party/2and3/polib.pyi
@@ -0,0 +1,156 @@
+import textwrap
+from typing import IO, Any, Callable, Dict, Generic, List, Optional, Text, Tuple, Type, TypeVar, Union, overload
+
+_TB = TypeVar("_TB", bound="_BaseEntry")
+_TP = TypeVar("_TP", bound="POFile")
+_TM = TypeVar("_TM", bound="MOFile")
+
+default_encoding: str
+
+# wrapwidth: int
+# encoding: str
+# check_for_duplicates: bool
+@overload
+def pofile(pofile: Text, *, klass: Type[_TP], **kwargs: Any) -> _TP: ...
+@overload
+def pofile(pofile: Text, **kwargs: Any) -> POFile: ...
+@overload
+def mofile(mofile: Text, *, klass: Type[_TM], **kwargs: Any) -> _TM: ...
+@overload
+def mofile(mofile: Text, **kwargs: Any) -> MOFile: ...
+def detect_encoding(file: Union[bytes, Text], binary_mode: bool = ...) -> str: ...
+def escape(st: Text) -> Text: ...
+def unescape(st: Text) -> Text: ...
+
+class _BaseFile(List[_TB]):
+    fpath: Text
+    wrapwidth: int
+    encoding: Text
+    check_for_duplicates: bool
+    header: Text
+    metadata: Dict[Text, Text]
+    metadata_is_fuzzy: bool
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
+    def __unicode__(self) -> Text: ...
+    def __contains__(self, entry: _TB) -> bool: ...  # type: ignore # AttributeError otherwise
+    def __eq__(self, other: object) -> bool: ...
+    def append(self, entry: _TB) -> None: ...
+    def insert(self, index: int, entry: _TB) -> None: ...
+    def metadata_as_entry(self) -> POEntry: ...
+    def save(self, fpath: Optional[Text] = ..., repr_method: str = ...) -> None: ...
+    def find(self, st: Text, by: str = ..., include_obsolete_entries: bool = ..., msgctxt: bool = ...) -> Optional[_TB]: ...
+    def ordered_metadata(self) -> List[Text]: ...
+    def to_binary(self) -> bytes: ...
+
+class POFile(_BaseFile):
+    def __unicode__(self) -> Text: ...
+    def save_as_mofile(self, fpath: Text) -> None: ...
+    def percent_translated(self) -> int: ...
+    def translated_entries(self) -> List[POEntry]: ...
+    def untranslated_entries(self) -> List[POEntry]: ...
+    def fuzzy_entries(self) -> List[POEntry]: ...
+    def obsolete_entries(self) -> List[POEntry]: ...
+    def merge(self, refpot: POFile) -> None: ...
+
+class MOFile(_BaseFile):
+    MAGIC: int
+    MAGIC_SWAPPED: int
+    magic_number: Optional[int]
+    version: int
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
+    def save_as_pofile(self, fpath: str) -> None: ...
+    def save(self, fpath: Optional[Text] = ...) -> None: ...  # type: ignore # binary file does not allow argument repr_method
+    def percent_translated(self) -> int: ...
+    def translated_entries(self) -> List[MOEntry]: ...
+    def untranslated_entries(self) -> List[MOEntry]: ...
+    def fuzzy_entries(self) -> List[MOEntry]: ...
+    def obsolete_entries(self) -> List[MOEntry]: ...
+
+class _BaseEntry(object):
+    msgid: Text
+    msgstr: Text
+    msgid_plural: List[Text]
+    msgstr_plural: List[Text]
+    msgctxt: Text
+    obsolete: bool
+    encoding: str
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
+    def __unicode__(self, wrapwidth: int = ...) -> Text: ...
+    def __eq__(self, other: object) -> bool: ...
+
+class POEntry(_BaseEntry):
+    comment: Text
+    tcomment: Text
+    occurrences: List[Tuple[str, int]]
+    flags: List[Text]
+    previous_msgctxt: Optional[Text]
+    previous_msgid: Optional[Text]
+    previous_msgid_plural: Optional[Text]
+    linenum: Optional[int]
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
+    def __unicode__(self, wrapwidth: int = ...) -> Text: ...
+    def __cmp__(self, other: POEntry) -> int: ...
+    def __gt__(self, other: POEntry) -> bool: ...
+    def __lt__(self, other: POEntry) -> bool: ...
+    def __ge__(self, other: POEntry) -> bool: ...
+    def __le__(self, other: POEntry) -> bool: ...
+    def __eq__(self, other: Any) -> bool: ...
+    def __ne__(self, other: Any) -> bool: ...
+    def translated(self) -> bool: ...
+    def merge(self, other: POEntry) -> None: ...
+    @property
+    def fuzzy(self) -> bool: ...
+    @property
+    def msgid_with_context(self) -> Text: ...
+    def __hash__(self) -> int: ...
+
+class MOEntry(_BaseEntry):
+    comment: Text
+    tcomment: Text
+    occurrences: List[Tuple[str, int]]
+    flags: List[Text]
+    previous_msgctxt: Optional[Text]
+    previous_msgid: Optional[Text]
+    previous_msgid_plural: Optional[Text]
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
+    def __hash__(self) -> int: ...
+
+class _POFileParser(Generic[_TP]):
+    fhandle: IO[Text]
+    instance: _TP
+    transitions: Dict[Tuple[str, str], Tuple[Callable[[], bool], str]]
+    current_line: int
+    current_entry: POEntry
+    current_state: str
+    current_token: Optional[str]
+    msgstr_index: int
+    entry_obsolete: int
+    def __init__(self, pofile: Text, *args: Any, **kwargs: Any) -> None: ...
+    def parse(self) -> _TP: ...
+    def add(self, symbol: str, states: List[str], next_state: str) -> None: ...
+    def process(self, symbol: str) -> None: ...
+    def handle_he(self) -> bool: ...
+    def handle_tc(self) -> bool: ...
+    def handle_gc(self) -> bool: ...
+    def handle_oc(self) -> bool: ...
+    def handle_fl(self) -> bool: ...
+    def handle_pp(self) -> bool: ...
+    def handle_pm(self) -> bool: ...
+    def handle_pc(self) -> bool: ...
+    def handle_ct(self) -> bool: ...
+    def handle_mi(self) -> bool: ...
+    def handle_mp(self) -> bool: ...
+    def handle_ms(self) -> bool: ...
+    def handle_mx(self) -> bool: ...
+    def handle_mc(self) -> bool: ...
+
+class _MOFileParser(Generic[_TM]):
+    fhandle: IO[bytes]
+    instance: _TM
+    def __init__(self, mofile: Text, *args: Any, **kwargs: Any) -> None: ...
+    def __del__(self) -> None: ...
+    def parse(self) -> _TM: ...
+
+class TextWrapper(textwrap.TextWrapper):
+    drop_whitespace: bool
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...