We have initTranslations() for binding an extension's
gettext domain, but nothing to help with using gettext
from an extension.
Such help would be useful though, as an extension that
calls textdomain() like a normal application would
inadvertently changes the default domain for the whole
gnome-shell process.
Instead, extensions have to use domain-specific versions
of the gettext functions:
```js
const Gettext = imports.gettext.domain('my-extension');
const _ = Gettext.gettext;
```
Make this a bit easier by adding those functions directly
to the extensions object when initTranslations() is called,
then expose helper functions for calling them.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2594
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1941>
When we allow users to choose between different templates, we should
provide some context for each template to facilitate that choice.
Add that metadata in the form of a .desktop file, which allows us to
specify name and description, and is well supported by our translation
infrastructure.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/812
The template used when creating a new extension is intentionally
minimal, as the sample code in the old extensions-tool proved to
be annoying more often than not.
However as we support per-command options, we don't have to limit
ourselves to a single template, and can offer alternatives for
common use cases.
To prepare for that, namespace the existing template by moving it
into a subfolder.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/812
