E-mail word can be displayed on several lines

We should use unbreakable hyphen `\u2011` for all the words starting with `e-`or `E-`. There are many occurrences in many different languages.

For instance

```xml
Adresse e-mail
```

will become

```xml
Adresse e\u2011mail
```

Could be nice to add a rule in the check code quality to test that it does not appear again. `strings.xml` files are not parsed yet by this tool, so it has to be added, using a new dedicated file for the rules.

To be done during a Weblate sync, i.e. only when Weblate is locked.