By using the inventory named just 'trash' instead of 'creative_trash'
which overlaps when you name your player 'trash'.

Custom fields must start with an underscore, this is very relevant for `sound` which is already defined by the engine.

* Allow anyone to write to a book without any text and title.
* Allows saving books without any text or title.
* Adds a "Read" and "Write" tab to written owned books.

Fixes #1743

Co-authored-by: sfan5 <sfan5@live.de>

closes #2882

Have mushroom spread abm use group:mushroom to spread not only default red and brown but all defined shrooms.

Co-authored-by: Jason Cartwright <cartwrightjason49@gmail.com>

This happened when the same item was visible twice and one of them was a
group item. Fix it by ensuring that buttons that should have different
tooltips don't have the same element name.

Added the Brazilian Portuguese translation to all mods in the Minetest Game.

Only a single program was used to safely compress all textures in MTG.

 * `optipng -o7 -zm1-9 -nc -strip all -clobber %%f`

The key command used is -nc, which stops color mode changes. I.e. any RGBA textures will remain RGBA textures, with none being changes to 8-bit indexed mode.

utils/optimize_textures.sh performs this compression automatically, assuming optipng is installed.

Closes: #2818

This introduces z-fighting so we'll just undo it. closes #2812
This reverts commit 3fdd5cdb.