Show the unified 'last action' message on home and overview pages

In addition to that, try to display first and last name of the person, then fallback to the username

Pick note: We have changed the get_submission_message in Submission, so
  merging together the two codebases was somewhat problematic.

Conflicts:
	pootle/apps/pootle_statistics/models.py
	pootle/templates/home/home.html
Render empty stores in semi-transparent way

This includes moving the outer <tr>..</tr> tag from table.html into
_table_row.html template so that similar logic is not spread across multiple
templates

Pick note: Instead of moving the outher <tr>..</tr> tag from table.html into
    _table_row.html template we keep it in the original template to avoid
    complicating things. Anyway the whole contents of _table_row.html will
    be moved into table.html in a following commit.

    Also removed filter:alpha(opacity=65); from CSS since we no longer use
    that syntax.

Conflicts:
	pootle/templates/core/_table_row.html
Add 'suggestions' column to language and project overview pages

Conflicts:
	pootle/apps/pootle_language/views.py
	pootle/apps/pootle_project/views.py
Recover get_latest_for_dir() to ease merging the next commit
Display last activity column in the translation project browser table instead of the header

Pick notes: Like for other picked commits, not all the changes were picked
    because some of them already were done in the past.

Conflicts:
	pootle/apps/pootle_misc/browser.py
	pootle/apps/pootle_misc/stats.py
	pootle/apps/pootle_translationproject/views.py
Rearrange store overview page

This includes:
1) moving store path to breadcrumbs
2) changing the h2 header to match other overview pages
3) moving "Expand details" links into the header
4) moving the action links below the expandable stats.py
5) improving breadcrumb and expanded details styling

Pick notes: Had to do extensive changes because we already had picked changes
    done in Evernote fork after these ones.

Conflicts:
	pootle/apps/pootle_misc/stats.py
	pootle/apps/pootle_translationproject/views.py
	pootle/static/css/style.css
	pootle/templates/translation_projects/overview.html
Fixed even/odd cycling by merging templates

Note: if <tr class="{% cycle ...%}">...</tr> is moved into a separate
template, it seems not to work correctly. Since _table_row.html is only used
from within table.html (and both share the same presentation logic), the
easiest way to fix this is just to merge two templates into one.

Pick notes: Kept our custom template for the table (including tagging and
    goals).

Conflicts:
	pootle/templates/core/_table_row.html
	pootle/templates/core/table.html
Rename get_path_summary() method and CSS class names to better reflect the code semantics

Pick notes: Heavily adjusted to match the new way to display the info using
   AJAX and TreeItem.

Conflicts:
	pootle/apps/pootle_misc/stats.py
	pootle/apps/pootle_translationproject/views.py
	pootle/static/css/style.css
	pootle/templates/translation_projects/overview.html