German-Czech variants

I don't know much about this topic, but Bohemian people historically used both German and Czech variants of their names. These are currently not predicted by the name variant search tool.

One example is:
`Dora Rudolfine Richter`, also known as `Dora Rudolfa Richterová`

The issue identifies the name variant search tool but does not name a file or test. Start by locating that entry point and any existing variant-generation tests, then reproduce the Dora Rudolfine Richter/Dora Rudolfa Richterová example. Done means the tool predicts this German-Czech pairing and the behavior is covered by tests.

Written by the indexing model from the issue text.