add cumulative charts for project space viz
Merge pull request #1166 from dimagi/dom-viz

add cumulative charts for project space viz
refactor translations code

- seperate into its own file
- one class per translation strategy
add select-known translation strategy

selectively adds translations when needed instead of dumping them all
also uses version 2 translations (tyler's)
Merge branch 'better-translation-option' into test