[vjpixel]

Follow-up to #1016.

Changes

• Reset form errors (password_reset.jinja2): the error loop used form.errors.items without calling it. Jinja2 raises TypeError: 'builtin_function_or_method' object is not iterable on that, so posting an invalid email to /users/reset-password/ returned a 500 instead of showing the error. Confirmed by rendering the snippet with Jinja2 and a dict of errors. Now calls items(), as password_reset_confirm.jinja2 already does.
• Reset email and subject: PasswordResetView renders password_reset_email.html and password_reset_subject.txt through render_to_string. The Jinja2 backend comes first in TEMPLATES and the files live under jinja2/, so Jinja2 renders them with the i18n extension (newstyle gettext). Their text is now wrapped in _(), with the address passed as %(email)s. LocaleMiddleware has the request's language active when the email is sent, so the email goes out in the language the user browsed in.
• etc/babel.cfg: the existing pattern only matches **.jinja2, so I added the two files. Otherwise make translate_<lang> would not extract their msgids and would mark them obsolete. Checked with pybabel extract -F ./etc/babel.cfg: it picks up the 5 new msgids.
• pt_BR / es_ES: translations for the 5 new msgids. I edited the files by hand and kept CRLF. polib reports 0 untranslated, 0 fuzzy, no placeholder mismatches and no duplicates, and both catalogs compile. Rendering the templates with the compiled catalogs gives the translated subject and body with the address filled in.
• Tests (src/users/tests/test_reset_password.py): posting an invalid email returns 200 and shows "Enter a valid email address." A registered email gets one message with the subject and the reset link.

The email body loses the leading indentation and the line breaks inside each paragraph, so each paragraph is one msgid.

Not changed: the email is plain text, but the address is still HTML-escaped by autoescape (e.g. o'neil@… becomes o'neil@…). This was already the case before this PR.

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