[IMP] product,stock,lunch: Uniformize 'Product Category' accross views and menus

PURPOSE
=======

Ensure terms consistency across Odoo

Specification
=============

All the menus and fields labels which are related to product.category should be named "Product Category" (if field label) and "Product Categories" (if menu entry)

addons/lunch/models/lunch.py

@@ -231,7 +231,7 @@ class LunchProduct(models.Model):
     _description = 'lunch product'
 
     name = fields.Char('Product', required=True)
-    category_id = fields.Many2one('lunch.product.category', 'Category', required=True)
+    category_id = fields.Many2one('lunch.product.category', 'Product Category', required=True)
     description = fields.Text('Description')
     price = fields.Float('Price', digits=dp.get_precision('Account'))
     supplier = fields.Many2one('res.partner', 'Vendor')
@@ -243,7 +243,7 @@ class LunchProductCategory(models.Model):
     _name = 'lunch.product.category'
     _description = 'lunch product category'
 
-    name = fields.Char('Category', required=True)
+    name = fields.Char('Product Category', required=True)
 
 
 class LunchCashMove(models.Model):

addons/lunch/views/lunch_views.xml

@@ -562,7 +562,7 @@
                     <field name="description"/>
                     <group expand="0" string="Group By">
                         <filter name="supplier" string="Vendor" context="{'group_by': 'supplier'}"/>
-                        <filter name="category" string="Category" context="{'group_by': 'category_id'}"/>
+                        <filter name="category" string="Product Category" context="{'group_by': 'category_id'}"/>
                         <filter name="inactive" string="Archived" domain="[('active','=',False)]"/>
                     </group>
                 </search>

addons/product/models/product_template.py

@@ -56,7 +56,7 @@ class ProductTemplate(models.Model):
              'the e-commerce such as e-books, music, pictures,... The "Digital Product" module has to be installed.')
     rental = fields.Boolean('Can be Rent')
     categ_id = fields.Many2one(
-        'product.category', 'Internal Category',
+        'product.category', 'Product Category',
         change_default=True, default=_get_default_category_id,
         required=True, help="Select category for the current product")
 

addons/product/views/product_views.xml

@@ -44,7 +44,7 @@
                             <group>
                                 <group name="group_general">
                                     <field name="type"/>
-                                    <field name="categ_id" string="Category"/>
+                                    <field name="categ_id" string="Product Category"/>
                                 </group>
                                 <group name="group_standard_price">
                                     <field name="list_price" widget='monetary' options="{'currency_field': 'currency_id'}"/>

addons/stock/models/stock_inventory.py

@@ -83,7 +83,7 @@ class Inventory(models.Model):
              "system propose for a single product / lot /... ")
     total_qty = fields.Float('Total Quantity', compute='_compute_total_qty')
     category_id = fields.Many2one(
-        'product.category', 'Inventoried Category',
+        'product.category', 'Product Category',
         readonly=True, states={'draft': [('readonly', False)]},
         help="Specify Product Category to focus your inventory on a particular Category.")
     exhausted = fields.Boolean('Include Exhausted Products', readonly=True, states={'draft': [('readonly', False)]})