Adds new strings

Add new strings related to commit 7f6c8ef
Replace string

Replace: "Pantalla guardada como" --> "Captura de pantalla guardada como"
set "cython" as a default variable of RENPY_CYTHON
Merge pull request #270 from LuqueDaniel/update-es

Update Spanish translation
Merge pull request #269 from vbkaisetsu/default-env

Please set "cython" to RENPY_CYTHON
Split _developer.rpym into multiple modules.
Redesign style inspector into displayable inspector.
Use slightly nicer names for screens.
Hide the Fixed immediately inside a screen.

It's not that interesting, since it's always there and never has
properties.
Allow viewports shrink to fit their content.

This only occurs when the viewports have xfill or yfill set
to False.
Add the ability to inspect a style and display the properties
that contribute to the displayable.
Quote newlines in Text.__unicode__.
Fix get_text_style.

It didn't handle default correctly.