Update changelog before release

Julien LepillerSat Aug 31 13:33:28+0200 2019

423e2b9

Update changelog before release

CHANGELOG

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* When an error occurs while fetching a project, an error message is shown and
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  the new project window re-opens with the same details as before
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* Create a new ts file for languages not yet supported by a Qt project
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* Open the settings window when creating a project for which the platform was
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  not configured yet
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=== UI Changes ===
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* Unsupported formats raises a specific exception that can be caught by the UI
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* Stop crashing when an error occurs during project fetching
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* Properly load empty translations in ts format
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* Properly update fuzzy flags in ts format
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* Fix crash when editing a project
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* Fix fetching a non default branch of a git project
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=== Languages ===
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* Update 'en' and 'fr' translations.
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Changes since 0.2
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