made the RIGID flag work for containers

Container without that flag add the volume of their content to the total volume of the item.
Container with that flag show just the containers volume and ignore the content.
fix waterskin2, should have different volume, not bash modi
Electronic cigarettes.
Removed unused code.
Specify that some e-cigs are disposable.
Add e-cigs to item groups.
Set turns_per_charge to 1 instead of 20, just in case - not sure if it's necessary.
Better description of advanced e-cigs.
option to change the language
More vehicle stuff

Added Mark 19 Grenade Launcher and fixed the APC so it was more of an
APC and less of an armored bus. Plans to add Electrified Hull Plating,
Impact Resistant Hull Plating (For plows), and set up turrets to not
blow up their own vehicle. Also added M2 Browning and Mark 19 to the
bunker heavy weapons spawn.
Fixed the Turrets.

And some typos. Also laid the groundwork for the Electrified Plating and
the Impact Resistant Plating.
What Bug?

There is no bug. You saw nothing. No lazy copy/paste that I forgot to
fix properly. You saw nothing.
Pulled Elec and Impact Resist Plating

Because I have no idea how to do it and people are excited enough for
what's done as is.
Rudimentary grammatical number support for items

First try in inventory UI
Add some test plural item names

Ammo in this case
Make crafting components respect grammatical number
Load name_plural field from JSON

If name_field is missing, append a “s” by default.
Fix item factory plurals and ammo examples
Create plural forms for other JSON items (without mods)
Small JSON fixes