Issue title: Text does not get translated with _ if such text is inside a macro
 Issue body: I have the following Macro:
```
{% macro display_errors(errors,modal=false) %}
    {% if modal == false %}
        {% for error in errors %}
            <div class="alert alert-danger alert-dismissable">
                <button aria-hidden="true" data-dismiss="alert" class="close" type="button">×</button>
                {{ error }}.
            </div>
        {% endfor %}
    {% else %}
        {% if errors|length > 0 %}
            <div class="alert alert-danger alert-dismissable">
                <button aria-hidden="true" data-dismiss="alert" class="close" type="button">×</button>
                {{ _('The last action reported errors') }}. <button type="button" class="btn btn-danger" data-toggle="modal" data-target="#error_modal">{{ _('See errors') }}</button>
            </div>
        {% endif %}
    {% endif %}
{% endmacro %}
```
Which I use with a code like:
```
{% import 'dashboard/macros/form.jinja2' as form %}
...
{{ form.display_errors(errors,true) }}
```
Even though I have the text "The last action reported errors" in the .po files and the rest of the App translates properly, the message inside the macro does not get translated.

```
#: formshare/templates/dashboard/macros/form.jinja2:17
msgid "The last action reported errors"
msgstr "La última acción reportó errores"
```


Environment:
- Python version: 3.8.5
- Jinja version: 2.11.3
- Babel version: 2.8.0

 Comments: 
 Comment 0: Translating inside a macro works for me. Maybe you forgot to recompile the .po to .pm (this happens to me a lot)


-   Python version: 3.8.7
-    Jinja version: 2.11.2
-    Babel version: 2.9.0

 Comment 1: I recompile the .po into .mo . All my translations use `_` 

I tried by adding a new translation string to the macro file for example `title="{{ _('Close') }}"` and other just the same in an element outside the macro.

After `python setup.py extract_messages`, `python setup.py update_catalog`, translating the string, and `python setup.py compile_catalog` the string inside the macro does not translate but the one outside does.


{'source': 'GithubIssues', 'repo_name_with_owner': 'pallets/jinja', 'issue_id': 846643683, 'repo_stars': 8842.0}