Issue 1623 - Removed unused translation

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extra : rebase_source : ce5ae5ac0188e8da19206657b1cae56a02979f73
Issue 1625 - Improve string descriptions, addressing comments on CrowdIn

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extra : rebase_source : b96332da6cffb062da63663d6f1b1b4028d60917
Issue 1643 - Optimized short description for Chrome Web Store