Learnt from: KJhellico
PR: vacanza/holidays#2684
File: holidays/locale/it/LC_MESSAGES/SM.po:13-13
Timestamp: 2025-06-28T10:39:19.185Z
Learning: In the holidays project, .po file header comments use the format "# [Country] holidays." for default language files (without trailing hash) and "# [Country] holidays [locale] localization." for non-default language files (also without trailing hash).

Learnt from: KJhellico
PR: vacanza/holidays#2530
File: holidays/locale/ca/LC_MESSAGES/AD.po:31-40
Timestamp: 2025-05-06T15:25:44.333Z
Learning: In the Holidays project, msgid fields in localization files contain strings in the entity's default language (as defined by default_language attribute), not English source strings as in standard gettext implementations.

Learnt from: KJhellico
PR: vacanza/holidays#2676
File: holidays/locale/en_US/LC_MESSAGES/TN.po:17-28
Timestamp: 2025-06-26T15:34:35.476Z
Learning: In the holidays project, .po file header metadata updates (version numbers, revision dates, translator information) are legitimate changes when part of localization work and don't require `make l10n` regeneration. The `make l10n` command is primarily for formatting fixes and missing translator comments, not for intentional metadata updates.

Learnt from: KJhellico
PR: vacanza/holidays#2259
File: holidays/locale/en_IN/LC_MESSAGES/IN.po:30-299
Timestamp: 2025-03-05T17:51:00.633Z
Learning: In the Holidays project, .po files for a country's default locale use empty msgstr fields as a standard convention.

Learnt from: KJhellico
PR: vacanza/holidays#2388
File: holidays/locale/en_CI/LC_MESSAGES/CI.po:88-88
Timestamp: 2025-03-30T18:25:07.087Z
Learning: In the holidays library, localization files have a specific structure: message comments are in standard English (en_US) describing the holiday, while actual translations (msgstr) should use the locale-specific terminology (e.g., en_CI for Ivory Coast English). For example, "Night of Power" in standard English is translated as "Lailatou-Kadr" in Ivory Coast English.

Learnt from: KJhellico
PR: vacanza/holidays#2259
File: holidays/locale/en_IN/LC_MESSAGES/IN.po:285-299
Timestamp: 2025-03-08T11:28:48.652Z
Learning: In the holidays project, message IDs (msgids) in locale files use region-specific naming conventions (e.g., "Muharram", "Id-ul-Fitr" in en_IN locale for India), while translator comments use internationally recognized names from the project's default locale (en_US) such as "Ashura", "Eid al-Fitr". This difference is intentional for proper localization.

Learnt from: ankushhKapoor
PR: vacanza/holidays#2601
File: holidays/locale/en_MN/LC_MESSAGES/MN.po:13-14
Timestamp: 2025-06-11T18:32:25.595Z
Learning: For non-default locale `.po` files, the header comment format is:
`# <Country> holidays <locale> localization.` (no trailing hash).

Learnt from: KJhellico
PR: vacanza/holidays#2687
File: holidays/locale/en_US/LC_MESSAGES/CF.po:13-28
Timestamp: 2025-06-29T09:37:35.283Z
Learning: In the holidays project, .po files follow a standard formatting convention where there is always a blank line after the metadata header section (after the "X-Source-Language" line). This blank line separates the header from the actual translation content and should not be removed.

Learnt from: KJhellico
PR: vacanza/holidays#2651
File: holidays/locale/nl/LC_MESSAGES/BQ.po:29-95
Timestamp: 2025-06-25T20:55:00.642Z
Learning: In the holidays library, Dutch locale files (.po) with `X-Source-Language: nl` should have empty msgstr entries when the target language is also Dutch. The library uses fallback=True with gettext, which returns the original msgid when msgstr is empty. This is the correct pattern for native language files and does not cause blank holiday names.

Learnt from: KJhellico
PR: vacanza/holidays#2831
File: holidays/countries/south_sudan.py:28-31
Timestamp: 2025-08-19T20:04:26.215Z
Learning: In the holidays library, message comments (comments describing message format templates like "%s (estimated)." and "%s (observed, estimated).") always end with a period, even when the corresponding string values do not include the period.

Learnt from: PPsyrius
PR: vacanza/holidays#2676
File: holidays/locale/ar/LC_MESSAGES/EG.po:0-0
Timestamp: 2025-06-25T10:09:29.029Z
Learning: In the holidays library, msgstr fields can be left empty for source/default_language files when using Lingva, the localization tool used by the project.

Learnt from: PPsyrius
PR: vacanza/holidays#2537
File: holidays/countries/finland.py:249-253
Timestamp: 2025-05-10T04:02:13.815Z
Learning: Holiday name comments directly above tr() function calls in the holidays package should only contain the holiday name itself (e.g., "# Independence Day.") without any additional context, dates, or historical information.

Learnt from: PPsyrius
PR: vacanza/holidays#2676
File: holidays/countries/tunisia.py:25-25
Timestamp: 2025-06-25T10:12:30.448Z
Learning: The holidays library intentionally duplicates label strings like `estimated_label` across country modules rather than centralizing them. This duplication is the established library-wide approach and should not be suggested for refactoring.

Learnt from: PPsyrius
PR: vacanza/holidays#2843
File: holidays/countries/burundi.py:13-13
Timestamp: 2025-08-21T04:51:16.392Z
Learning: In the holidays library, country classes with localization support consistently use `from gettext import gettext as tr` import and wrap class-level attributes like `estimated_label`, `observed_label`, and `observed_estimated_label` with `tr()` calls. This is the standard library-wide practice for l10n-enabled entities and is required for proper string extraction when generating .po files.

Learnt from: PPsyrius
PR: vacanza/holidays#2843
File: holidays/countries/burundi.py:63-101
Timestamp: 2025-08-21T04:56:03.711Z
Learning: In the holidays library, countries with localization support consistently use tr() wrappers around holiday names when calling _add_* methods (e.g., self._add_new_years_day(tr("Holiday Name"))). This is the established pattern across United States, Thailand, and other l10n-enabled countries, contrary to any suggestion that translation is handled internally by _add_* methods.

Learnt from: PPsyrius
PR: vacanza/holidays#2843
File: holidays/countries/burundi.py:63-101
Timestamp: 2025-08-21T04:56:03.711Z
Learning: In the holidays library, countries with localization support DO use tr() wrappers around holiday names when calling _add_* methods. This is the correct pattern for l10n-enabled country implementations, contrary to previous learning about translation being handled internally by _add_* methods.

Learnt from: PPsyrius
PR: vacanza/holidays#2678
File: holidays/locale/th/LC_MESSAGES/US.po:30-34
Timestamp: 2025-06-26T13:20:10.172Z
Learning: In the holidays library Thai localizations, the "observed" format consistently uses "ชดเชย%s" without spaces between the Thai word and placeholder across all .po files in the codebase.

Learnt from: PPsyrius
PR: vacanza/holidays#2407
File: snapshots/countries/TL_COMMON.json:7-7
Timestamp: 2025-04-03T05:59:57.480Z
Learning: In the holidays project, snapshot files (like snapshots/countries/TL_COMMON.json) are auto-generated when running `make snapshot` and should not be manually edited. Semicolons (;) in holiday entries are used as separators when multiple holidays occur on the same date.

Learnt from: PPsyrius
PR: vacanza/holidays#2354
File: holidays/countries/fiji.py:146-159
Timestamp: 2025-03-19T16:54:58.657Z
Learning: In the holidays library implementation, explicit holiday dates (like Diwali in Fiji) are only defined for historical years with official sources (2016-2025). Future dates beyond the explicitly defined range are automatically calculated by methods like `_add_diwali`, which provide approximations when official dates aren't yet available.

Learnt from: PPsyrius
PR: vacanza/holidays#2354
File: holidays/countries/fiji.py:185-188
Timestamp: 2025-03-19T16:53:00.375Z
Learning: In the Fiji holidays implementation, the `special_public_holidays_observed` dictionary in `FijiStaticHolidays` is only used for exceptions to the normal observance rules, not for documenting all holidays. Only 2019's Constitution Day needed a special entry as it didn't follow the standard patterns.

Learnt from: KJhellico
PR: vacanza/holidays#2465
File: holidays/countries/suriname.py:219-251
Timestamp: 2025-04-13T19:10:31.502Z
Learning: The `_CustomIslamicHolidays` classes in this project contain only exact verified holiday dates from reliable sources, rather than calculated or estimated future dates. This is by design to ensure accuracy, particularly for religious holidays that may follow lunar calendars or depend on local observations.

Learnt from: KJhellico
PR: vacanza/holidays#2386
File: holidays/countries/nepal.py:266-284
Timestamp: 2025-04-13T20:41:56.613Z
Learning: The Islamic holiday dates in the holidays library should only include officially verified dates, not predicted ones, to maintain accuracy. This is especially important for holidays that depend on lunar observations like Eid al-Fitr and Eid al-Adha.