translation status script

This script calculates these statistics:

	Discourse Translation Status Script
	To show details about a specific locale, run as:
	    ./script/translation-status.rb locale

	   locale |  cli+  |  cli-  |  cli=  | cli tot|  srv+  |  srv-  |  srv=  | srv tot
	----------------------------------------------------------------------------------
	        cs        3        4       14      605        0        0       18      405
	        de        7       42       22      605        4       37       11      405
	        es        8       27      266      605        7       25      370      405
	        fr        1        2       14      605        0        3       23      405
	        nl       12      128       19      605        5       85       24      405
	    pseudo        4        7        0      605        0        4        1      405
	        pt       17      121       36      605        8       82       30      405
	     zh_CN        8        9        8      605        6        8        2      405
	     zh_TW        8        9        8      605        6        8        2      405

This can be useful to see which locales are completely translated and which ones are still in progress.