CHORE(cost center): structure/style improvments

[jniles]

This commit fixes lots of HTML + CSS in all cost center modules. Some notable changes:

1. Use "clearfix" to handle content overflows instead of fixed heights in pixels.
2. Force tables to adopt a fixed height and scroll-y on overflow
3. Use proper bootstrap styles for form groups, labels, and static content
4. Use class="extend" to remove white footer
5. Translations implemented for cost_allocations
6. Use ng-options instead of ng-repeat for speed improvements and allow a default SELECT option
7. Loading indicators moved into table and "no data" messages do not show until data finished loading (#726).
8. Currencies are rendered with enterprise currency id
9. Currencies are right-aligned
10. Removed unused CSS files

Screenshots