Allow randomized quantities for map loot

This is similar to the recent enemy loot changes.
The new format is: `loot=id,x,y,chance,min_quantity,max_quantity`

`max_quantity` can be omitted for non-random quantities.
Update maps for randomized loot quantities
Combine "Bonus" and " XP: " in MenuCharacter

The "XP" part wasn't being translated (I thought it was), so we might as
well create a single string here.
Forgot a parenthesis
Update data.pl.po

Updated translations of all empty and "fuzzy" fields
Update data.pl.po

Updated translations of all empty and "fuzzy" fields
Update engine.pl.po

Written missing translation for "Trade"
Update data.fr.po
Merge pull request #502 from Pawonashi/patch-3

Update engine.pl.po
Merge pull request #497 from dorkster/bugfixes

Allow randomized quantities for map loot
Merge pull request #498 from dorkster/translate

Combine "Bonus" and " XP: " in MenuCharacter
Merge branch 'master' of https://github.com/clintbellanger/flare-engine

Conflicts:
	mods/default/languages/engine.pl.po
Merge pull request #226 from Pawonashi/patch-1

Update data.pl.po
Merge pull request #227 from Pawonashi/patch-2

Update data.pl.po
Update data.pl.po
Merge pull request #224 from dorkster/fixes

Update maps for randomized loot quantities
Merge pull request #228 from cjsthompson/patch-1

Update data.fr.po
Merge pull request #230 from stefanbeller/master

Add game prefix to alpha_demo mod, beautify the language translation readmes.