Some german translations

Translated manually
CSV fixups for those German translations.
Dump translations for official languages by default.

I don't really like this but ehhhhhhh, the system for prose
translations seems to be to keep them in csv/translations/, and I can't
figure out how you're supposed to DO that, plus judging by the age of
the single file that's in there, that seems to be where translations go
to die.
Load/dump dance.
Give Furfrou's default form a name.

This is what it is in the text file full of form names (#5).
Update Natural Furfrou's identifiers.
Delete all the blank rows in pokemon_form_names.

All the tests still pass and everything.  We literally did not need them
after that innerjoin=True got commented out.
Add unreleased moves.

I also changed Celebrate's effect to "unknown", which I meant to commit
separately but it got caught up in this one.  It has a unique effect ID,
and we don't know for sure that it does nothing.  Also, Splash's effect
(which it was sharing) says that the move is disabled by Gravity, which
isn't true of Celebrate.
Add unreleased Pokémon.
Set order columns to accomodate new Pokémon.
Add flavour text for Hoopa and Volcanion.

I knew I was forgetting something.
Add game indices for natures.

I'm assuming (and I'm 99% sure I'm right) that the internal order for
natures has never changed.
Clarify that natures.game_index is 1-indexed.

Given that nature was determined by pid % 25 for a long time, I think
this is important to note.
Rerip nature names from X.

In previous gens, Spanish nature names only ever appeared in the
feminine form, so that's what we had.  Now it looks like the isolated
nature names default to masculine — they're still feminine on the status
screen, but in the box you get "Naturaleza:   [adjective]" and I guess
the adjective is considered to be on its own rather than modifying
naturaleza.

Italian doesn't follow suit so I guess it gets to be the one special
snowflake language where we don't have the default dictionary form for
natures.