[MC-122579] All COLOR_wall_banners are missing translation keys

As of 17w47a the wall banners got split up per base color, and every block in the game has its own translation key.

But, wall banners only have 1 translation key: block.minecraft.wall_banner unlike all other blocks and is not actually used.
There should be block.minecraft.COLOR_wall_banner for each color instead, like the game tries to get.

This can be seen in CanPlaceOn and CanDestroy tags.

This can be fixed by adding the following to the lang file:

block.minecraft.white_wall_banner=White Wall Banner
block.minecraft.orange_wall_banner=Orange Wall Banner
block.minecraft.magenta_wall_banner=Magenta Wall Banner
block.minecraft.light_blue_wall_banner=Light Blue Wall Banner
block.minecraft.yellow_wall_banner=Yellow Wall Banner
block.minecraft.lime_wall_banner=Lime Wall Banner
block.minecraft.pink_wall_banner=Pink Wall Banner
block.minecraft.gray_wall_banner=Gray Wall Banner
block.minecraft.light_gray_wall_banner=Light Gray Wall Banner
block.minecraft.cyan_wall_banner=Cyan Wall Banner
block.minecraft.purple_wall_banner=Purple Wall Banner
block.minecraft.blue_wall_banner=Blue Wall Banner
block.minecraft.brown_wall_banner=Brown Wall Banner
block.minecraft.green_wall_banner=Green Wall Banner
block.minecraft.red_wall_banner=Red Wall Banner
block.minecraft.black_wall_banner=Black Wall Banner