* Fix a bug with plain text search.
* The undo/redo history is no longer cleared after saving.
* The search is no longer cleared when switching from the hexadecimal view to the plain text view and vice versa.
* German translation added, thanks to iNtEgraIR2021.

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