ability to translateinput text to a given language

[yplassiard]

Given an input text from a designed user interface dialog in the add-on, add the ability yo ytanslate it to the desired language and copy the result to the clipboard.

Typical workflow

• Use a gesture to bring the input translate dialog
• select the source / destination language
• type the text to translate
• press the "copy to clipboard" button
• optionnally, use the "Insert here" button to insert the text in the focused edit field.

For the "insert here" feature, the user shall be on an edit field (either multi-line or not) before using this gesture.

[yplassiard]

Add the ability yo retrieve the text from the focused edit box and directly replace it with the translated text