Impacted versions:
Master branch, should by 12.0

Steps to reproduce:
Install a third party addon with localization po file in i18n folder, even loading translation manually, the translation won't work, The console reports error: Translation .... not found in reference pot, skipping.
Reverse the change of  "odoo/tools/translate.py" in this commit, the issue was gone.

Expected behavior:
The po translation works as before.



odoo/tools/translate.py
_logger = logging.getLogger(__name__)
WEB_TRANSLATION_COMMENT = "openerp-web"
SKIPPED_ELEMENTS = ('script', 'style', 'title')
_LOCALE2WIN32 = {
    'af_ZA': 'Afrikaans_South Africa',
    'sq_AL': 'Albanian_Albania',
    'ar_SA': 'Arabic_Saudi Arabia',
    'eu_ES': 'Basque_Spain',
    'be_BY': 'Belarusian_Belarus',
    'bs_BA': 'Bosnian_Bosnia and Herzegovina',
    'bg_BG': 'Bulgarian_Bulgaria',
    'ca_ES': 'Catalan_Spain',
    'hr_HR': 'Croatian_Croatia',
    'zh_CN': 'Chinese_China',
    'zh_TW': 'Chinese_Taiwan',
    'cs_CZ': 'Czech_Czech Republic',
    'da_DK': 'Danish_Denmark',
    'nl_NL': 'Dutch_Netherlands',
    'et_EE': 'Estonian_Estonia',
    'fa_IR': 'Farsi_Iran',
    'ph_PH': 'Filipino_Philippines',
    'fi_FI': 'Finnish_Finland',
    'fr_FR': 'French_France',
    'fr_BE': 'French_France',
    'fr_CH': 'French_France',
    'fr_CA': 'French_France',
    'ga': 'Scottish Gaelic',
    'gl_ES': 'Galician_Spain',
    'ka_GE': 'Georgian_Georgia',
    'de_DE': 'German_Germany',