* Fix a crash when closing the application.
* Now the lines are indexed according to the position in the file (in the partial opening mode).
* Fix a bug with the partial file opening context.
* Changing the name of the "Sequential opening" menu to "Partial file opening" and adding a shortcut button on the main page.
* Fix a bug that overwrites the source file and creates an empty file when the user uses the "Save As" menu.
* Modification of the display of the dialog box used for the partial opening of files.
* Added a test on the amount of memory still available for the application when opening a file.

Please note that new text additions are mostly translated via DeepL (German+Spanish).

Translations:
* Chinese: @sr093906 
* English: @Keidan
* French: @Keidan
* German: @iNtEgraIR2021
* Russian: @OmlineEditor
* Spanish: @sguinetti
