Let get_translation accept any python path

In 0.23 a regression was introduced that forced the use of
`get_translation(__package__)` instead of `get_translation(__name__`).
This change adds a fallback to allow the old style alongside.
It may however be removed in the future.

Fixes pulp#874

CHANGES/874.bugfix

@@ -0,0 +1 @@
+Fixed a regression introduced in `get_translations`.

pulp-glue/pulp_glue/common/i18n.py

@@ -29,5 +29,11 @@ def get_translation(name: str) -> gettext.NullTranslations:
         _ = translation.gettext
         ```
     """
-    localedir = files(name) / "locale"
-    return gettext.translation("messages", localedir=str(localedir), fallback=True)
+    name_parts = name.split(".")
+    while name_parts:
+        try:
+            localedir = files(".".join(name_parts)) / "locale"
+            return gettext.translation("messages", localedir=str(localedir), fallback=True)
+        except TypeError:
+            name_parts.pop()
+    raise TypeError(f"No package found for {name}.")