【Odoo翻译】修正odoo8.0中的Quant和case翻译项

1、修正【采购】菜单下的Quant修改为【源】，溯源的源；
2、修正【会计】菜单下的case修改为【专案】，与前一菜单中的Tax Case Name【税金专案名称】相对应。
3、修正：
Please note that: Orders will only be merged if: Purchase Orders are in draft Purchase Orders belong to the same supplier Purchase Orders are have same stock location, same pricelist, same currency Lines will only be merged if: Order lines are exactly the same except for the product,quantity and unit

的翻译项，去除*星号特殊符号保持英文原文中所使用的符号，修改为汉语语法。