Adds i18n, english l10n, CHANGELOG and lesserphp instead of lessphp

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## Unreleased
+
+### Added
+
+* i18n system
+* English l10n
+* Changelog
+
+### Changed
+
+* Use lesserphp instead of lessphp
+
+## 1.2.0 - 2020-03-23
+
+### Added
+
+* Ability to chooses QR code colors
+
+### Changed
+
+* The software is now named LibreQR
+* Parameters now uses GET instead of POST
+* The OpenSearch plugin now generate QR codes with arguments used when added
+
+## 1.1.0 - 2019-03-29
+
+### Added
+
+* OpenSearch
+* WebManifest
+
+### Changed
+
+* Server-side LESS compilation
+* Icons are now themed and in multiple dimensions
+
+### Fixed
+
+* Placeholder font
+
+## 1.0.0 - 2019-02-13
+
+Initial release