Lua: Rename global variable “L” to “LOCALE”
Srsly, WTF? If we have to use global variables, at least give them descriptive names.
Lua scripts for engine testing. These scripts are the same as other Lua scripts
in Hedgewars, but you ought to call `EndLuaTest(TEST_SUCCESSFUL)` or
`EndLuaTest(TEST_FAILED)` when the test is completed.