i18n: Updates for project Deepin Desktop Environment (#347)

* [skip CI] Translate dde-dock.ts in lo

100% translated source file: 'dde-dock.ts'
on 'lo'.

* [skip CI] Translate trayplugin-loader.ts in lo

100% translated source file: 'trayplugin-loader.ts'
on 'lo'.

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Log:

Author: transifex-integration[bot]