work around inconsistent behavior of @ inside +
Add top-level semantics of Wiktionary entries

This now makes it through many entries of the Wiktionary JSONS files,
though it will presumably crash on something like an incomplete
template.
Wiktionary bugfixes

- For many relations, the default language is the same as the word being
  defined, not "en" from "en.wiktionary.org"
- Avoid some parsing errors with weirdly-used templates
Handle names of sub-languages of Chinese
add a simple example of a French->English definition