Add "duplicate strings" option to Assistant

[Martysh12]

Problem

I find myself going between different sub-projects very often to find the translation of a duplicate string.

Solutions

The following solutions are proposed:

• Add a "duplicate strings" option to Assistant, where Assistant would perform a sub-project-wide search to find the current string.
• Implement a "Favourites" menu so you could easily paste strings that are commonly used.
• Implement a "split-view" in Parlance, so it's easier to copy words from similar sub-projects.