To be consistent with the previous commit we update the text that appears
in the administration tables for discussions and proposals. Now instead of
"Proposals" and "Discussions" will appear "Title" which makes more sense
and is more consistent.
There are some sections where we are not reusing it:
* The budget investments search is completely different, so this
component isn't appropriate there
* Booth assignment and officers are slightly different, and I'm not
entirely sure it's safe to refactor these cases
The new CSV report was more configurable and could work on proposals,
processes and comments. However, it had several issues.
In the public area, by default it generated a blank file.
In the admin section, the report was hard to configure and it generated
a file with less quality than the old system.
So until we improve this system, we're bringing back the old investment
CSV exporter.
This commit reverts most of commit 9d1ca3bf.
