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.

They were replaced with exercise-metadata-item.

The goal of this component is abstracting away
the difference between metadata fields which are
strings and the ones which are arrays of strings.

This removes the <br> tags which were
previously inserted after every five elements.
Line breaks should be handled dynamically
by the browser.

This makes displaying metadata of an exercise
less verbose. Styling is a bit lacking as of now.

Restructure metadata translations of lists
to make declarations more concise.

This is done as to reduce the file size
and complexity of the exercise-details component.

Prior to this change, the image would
become full-width on narrow screens,
which looks awful.

Let the mailto link actually include
the email address instead of consisting
only of "mailto:"

This makes it look like the other buttons
in the modal, i.e. with an outline and white background.

The presence of "disabled" in a HTML tag
is sufficient to disable it.
Assigning a value has no effect.

added GitlabService.java to offer basic gitlab api functionalities like check if repo exists etc. , added check in StatisticsResource to avoid people sending get requests with IDs which not exist and therefore create lots of trash entities

The presence of the "disabled" attribute
in a HTML tag is enough to disable it.
It does not take a value.