wrote query to sum up the number of watchlist entries for an exercise id, then wrote the test and merged development into my branch

This is no longer an enum, so we cannot reliably
translate it.

This accepts data from the updated backend
(from the previous commit) but does not display
any of the new metadata yet.

This is not tested with search results, because I could
not obtain search results locally. Suggestions on the
home page work, but no results are shown in /search

refactored statistics so that they are loaded by the statistics service and then resolved the collections bug

disabled button when not logged in, allowed get request for number of likes and has liked for not logged in user

resolved error with fontsawesome that it worked with yarn start but not with mvnw as mvnw uses npm and the package.lock had the wrong fontawesome version but the yarn had

repaired UI display of types and languages as it was again hidden behind the exercise cards on small screens

In the escape sequence "·" there was unicode
code point 0332 (UTF-8 cc b2), which is a
"combining low line". I think this does not belong
in there.

The exercise metadata component is only rendered
when it gets a value which is not null and has
a length of at least one (either string or array).
If it gets a value which is translated before it
is being passed, the result will be something of
the form "translation-not-found[...]", which has
a length of at least one, so it is rendered.
To prevent this, check if a value is set before
translating it.