User's Dashboard Recent Activity

[didoda]

This introduces a change on the user's dashboard "recent items" section.

Contents are slightly different, representing "user's activity" (fetching data from history endpoint): this means that there could be the same object in multiple rows (different changes on the same object).

Comparing to the previous version, this fetches also data modified sometime by the authenticated user, and with last modification by another user.
The content for each row is:

• Title or #id uname: the title, if available, #id uname otherwise
• Object type: the object type
• Action: the action performed (can be "update", "trash", etc.)
• Changed: the list of fields that has been changed
• Date: the date time for the change

Data is paginated. Deleted objects are "line-through" style strings.

The component <recent-activity> is reusable (for instance, we could use it to have an insight on user activity, in user object view).

Bonus: javascript fix in placeholders.js

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (68570fe) 99.65% compared to head (4520eec) 99.67%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1070      +/-   ##
============================================
+ Coverage     99.65%   99.67%   +0.02%     
+ Complexity     1168     1166       -2     
============================================
  Files            91       91              
  Lines          4611     4601      -10     
============================================
- Hits           4595     4586       -9     
+ Misses           16       15       -1     

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