chore: remove crowdin i18n integration

The Crowdin sync has been broken since May 2025 — the scheduled
download workflow has failed on every run since (git auth failure,
exit 128), so no translations have flowed in for ~14 months.

Remove the integration and keep the catalogs in-repo:

- delete crowdin.yml and the download/upload workflows
- document the Lingui-only flow in CONTRIBUTING.md
- strip stale X-Crowdin-* headers from the non-English catalogs

No runtime change: translations still ship from the committed .po
files. i18n-check.yml was already Crowdin-independent and is now the
sole i18n CI guard.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: sammdec

.github/workflows/crowdin-download.yml

@@ -188,19 +188,17 @@ To add a new token to the app, the process is pretty simple. All you’ll need t
 
 ## Translations
 
-Aave uses [Crowdin](https://crowdin.com/) for translation management and internationalization. We only update strings within the app. Everything else is downloaded from Crowdin. For more information, such as installing their CLI tool, read their [documentation](https://developer.crowdin.com/api/v2/).
+Aave uses [Lingui](https://lingui.dev/) for internationalization. Translation catalogs live in `src/locales/<locale>/messages.po` and are maintained directly in this repository — `src/locales/en/messages.po` is the source catalog, generated from the `Trans` macros and `t` calls in the code.
 
-To upload strings:
+After adding or changing strings in the app, regenerate the catalogs:
 
 ```bash
-crowdin upload sources
+pnpm i18n
 ```
 
-To download strings:
+This runs `i18n:extract` (updates `messages.po` for every configured locale with the strings found in the source) followed by `i18n:compile` (builds the `messages.js` files the app loads at runtime). Commit the resulting `.po` changes along with your code.
 
-```bash
-crowdin download
-```
+Translations for non-English locales are filled in by hand in the corresponding `messages.po` file. Any string left with an empty `msgstr` falls back to English.
 
 If you would like to add support for a new language across the app, please [open up an issue](https://github.com/aave/interface/issues/new/choose) and add the `i18n` label to it. This helps us categorize, and it will also help to gauge public interest for the new language. If the community decides to go forward with your preferred language, you may open up a pull request. Please follow the template of [this PR](https://github.com/aave/interface/pull/447#issue-1165545965).
 

.github/workflows/crowdin-upload.yml

@@ -12,11 +12,6 @@ msgstr ""
 "Last-Translator: \n"
 "Language-Team: German\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
-"X-Crowdin-Project: aave-interface\n"
-"X-Crowdin-Project-ID: 502668\n"
-"X-Crowdin-Language: de\n"
-"X-Crowdin-File: /src/locales/en/messages.po\n"
-"X-Crowdin-File-ID: 46\n"
 
 #: src/components/transactions/StakeCooldown/StakeCooldownModalContent.tsx
 msgid "If you DO NOT unstake within {0} of unstake window, you will need to activate cooldown process again."

CONTRIBUTING.md

@@ -12,11 +12,6 @@ msgstr ""
 "Last-Translator: \n"
 "Language-Team: Greek\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
-"X-Crowdin-Project: aave-interface\n"
-"X-Crowdin-Project-ID: 502668\n"
-"X-Crowdin-Language: el\n"
-"X-Crowdin-File: /src/locales/en/messages.po\n"
-"X-Crowdin-File-ID: 46\n"
 
 #: src/components/transactions/StakeCooldown/StakeCooldownModalContent.tsx
 #: src/modules/umbrella/StakeCooldownModalContent.tsx

crowdin.yml

@@ -12,11 +12,6 @@ msgstr ""
 "Last-Translator: \n"
 "Language-Team: Spanish\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
-"X-Crowdin-Project: aave-interface\n"
-"X-Crowdin-Project-ID: 502668\n"
-"X-Crowdin-Language: es-ES\n"
-"X-Crowdin-File: /src/locales/en/messages.po\n"
-"X-Crowdin-File-ID: 46\n"
 
 #: src/components/transactions/StakeCooldown/StakeCooldownModalContent.tsx
 #: src/modules/umbrella/StakeCooldownModalContent.tsx

src/locales/de/messages.po

@@ -12,11 +12,6 @@ msgstr ""
 "Last-Translator: \n"
 "Language-Team: French\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
-"X-Crowdin-Project: aave-interface\n"
-"X-Crowdin-Project-ID: 502668\n"
-"X-Crowdin-Language: fr\n"
-"X-Crowdin-File: /src/locales/en/messages.po\n"
-"X-Crowdin-File-ID: 46\n"
 
 #: src/components/transactions/StakeCooldown/StakeCooldownModalContent.tsx
 #: src/modules/umbrella/StakeCooldownModalContent.tsx

src/locales/el/messages.po

@@ -12,11 +12,6 @@ msgstr ""
 "Last-Translator: \n"
 "Language-Team: Russian\n"
 "Plural-Forms: nplurals=4; plural=((n%10==1 && n%100!=11) ? 0 : ((n%10 >= 2 && n%10 <=4 && (n%100 < 12 || n%100 > 14)) ? 1 : ((n%10 == 0 || (n%10 >= 5 && n%10 <=9)) || (n%100 >= 11 && n%100 <= 14)) ? 2 : 3));\n"
-"X-Crowdin-Project: aave-interface\n"
-"X-Crowdin-Project-ID: 502668\n"
-"X-Crowdin-Language: ru\n"
-"X-Crowdin-File: /src/locales/en/messages.po\n"
-"X-Crowdin-File-ID: 46\n"
 
 #: src/components/transactions/StakeCooldown/StakeCooldownModalContent.tsx
 msgid "If you DO NOT unstake within {0} of unstake window, you will need to activate cooldown process again."

src/locales/es/messages.po

@@ -12,11 +12,6 @@ msgstr ""
 "Last-Translator: \n"
 "Language-Team: Chinese Simplified\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
-"X-Crowdin-Project: aave-interface\n"
-"X-Crowdin-Project-ID: 502668\n"
-"X-Crowdin-Language: zh-CN\n"
-"X-Crowdin-File: /src/locales/en/messages.po\n"
-"X-Crowdin-File-ID: 46\n"
 
 #: src/components/transactions/StakeCooldown/StakeCooldownModalContent.tsx
 msgid "If you DO NOT unstake within {0} of unstake window, you will need to activate cooldown process again."