README.txt files: Change 'LGPL 2.1' to 'LGPLv2.1+'. Remove 'WTFPL'

mods/bucket/README.txt

@@ -4,9 +4,9 @@ See license.txt for license information.
 
 Authors of source code
 ----------------------
-Kahrl <kahrl@gmx.net> (LGPL 2.1)
-celeron55, Perttu Ahola <celeron55@gmail.com> (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
+Kahrl <kahrl@gmx.net> (LGPLv2.1+)
+celeron55, Perttu Ahola <celeron55@gmail.com> (LGPLv2.1+)
+Various Minetest developers and contributors (LGPLv2.1+)
 
 Authors of media (textures)
 ---------------------------

mods/carts/README.txt

@@ -6,7 +6,8 @@ itself is based on (and fully compatible with) the carts mod [2].
 
 The model was originally designed by stujones11 [3] (CC-0).
 
-Cart textures are based on original work from PixelBOX (WTFPL).
+Cart textures are based on original work from PixelBOX by Gambit (permissive
+license).
 
 
 [1] https://github.com/SmallJoker/boost_cart/

mods/default/README.txt

@@ -4,11 +4,11 @@ See license.txt for license information.
 
 Authors of source code
 ----------------------
-Originally by celeron55, Perttu Ahola <celeron55@gmail.com> (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
+Originally by celeron55, Perttu Ahola <celeron55@gmail.com> (LGPLv2.1+)
+Various Minetest developers and contributors (LGPLv2.1+)
 
 The torch code was derived by sofar from the 'torches' mod by
-BlockMen (LGPL 2.1)
+BlockMen (LGPLv2.1+)
 
 Authors of media (textures, sounds, models and schematics)
 ----------------------------------------------------------

mods/fire/README.txt

@@ -4,8 +4,8 @@ See license.txt for license information.
 
 Authors of source code
 ----------------------
-Originally by Perttu Ahola (celeron55) <celeron55@gmail.com> (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
+Originally by Perttu Ahola (celeron55) <celeron55@gmail.com> (LGPLv2.1+)
+Various Minetest developers and contributors (LGPLv2.1+)
 
 Authors of media (textures and sounds)
 --------------------------------------

mods/player_api/README.txt

@@ -7,8 +7,8 @@ Also sets the default model, texture, and player flags.
 
 Authors of source code
 ----------------------
-Originally by celeron55, Perttu Ahola <celeron55@gmail.com> (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
+Originally by celeron55, Perttu Ahola <celeron55@gmail.com> (LGPLv2.1+)
+Various Minetest developers and contributors (LGPLv2.1+)
 
 Authors of media (textures, models and sounds)
 ----------------------------------------------

mods/screwdriver/README.txt

@@ -4,8 +4,8 @@ See license.txt for license information.
 
 License of source code
 ----------------------
-Originally by RealBadAngel, Maciej Kasatkin (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
+Originally by RealBadAngel, Maciej Kasatkin (LGPLv2.1+)
+Various Minetest developers and contributors (LGPLv2.1+)
 
 License of media (textures)
 ---------------------------

mods/stairs/README.txt

@@ -4,6 +4,6 @@ See license.txt for license information.
 
 Authors of source code
 ----------------------
-Originally by Kahrl <kahrl@gmx.net> (LGPL 2.1) and
-celeron55, Perttu Ahola <celeron55@gmail.com> (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
+Originally by Kahrl <kahrl@gmx.net> (LGPLv2.1+) and
+celeron55, Perttu Ahola <celeron55@gmail.com> (LGPLv2.1+)
+Various Minetest developers and contributors (LGPLv2.1+)

mods/vessels/README.txt

@@ -4,9 +4,9 @@ See license.txt for license information.
 
 Authors of source code
 ----------------------
-Originally by Vanessa Ezekowitz (LGPL 2.1)
-Modified by Perttu Ahola <celeron55@gmail.com> (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
+Originally by Vanessa Ezekowitz (LGPLv2.1+)
+Modified by Perttu Ahola <celeron55@gmail.com> (LGPLv2.1+)
+Various Minetest developers and contributors (LGPLv2.1+)
 
 Authors of media (textures)
 ---------------------------

mods/walls/README.txt

@@ -4,4 +4,4 @@ See license.txt for license information.
 
 Authors of source code
 ----------------------
-Auke Kok <sofar@foo-projects.org> (LGPL 2.1)
+Auke Kok <sofar@foo-projects.org> (LGPLv2.1+)