Refactor wordcount function feature

[unho]

Right now Pootle allows to configure the wordcount function to use. There are two available functions: Pootle one and TTK one. Ideally both functions should be:

• Merged together and
• Placed in TTK (or in a separate package from Pootle and TTK)

Also Pootle should allow to set the wordcount function to use per project (like we do now for quality checks) instead of using a global setting.

[iafan]

What's the motivation behind having words counted differently for different projects?

[unho]

This is to allow maximum configurability in a scenario where a single Pootle server has several projects for several customers (where each customer only sees its projects) and each customer wants to use their wordcount settings. So instead of using the notion of customer idea we think it is easier to set it by project.

[iafan]

Of course it's up to you if you want to share one Pootle instance between customers, but I bet if this this what you end up with, you will need to do many tweaks here and there to support multiple customers, and this might not be the optimal route. Virtual servers are very cheap now, so I'd suggest just using private instances of Pootle for each customer and not spending time on complicating the core codebase. Just my $0.02.