Work Rest: Таймер помидор

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- Added the ability to keep the screen always on for the timer (configured in the settings)
- The restriction on checking the uniqueness of the category name has been relaxed. Now the uniqueness check is carried out only within current level of a category
- Changed the default work time to 25 minutes. So right on the tomato technique
- Removed the default timer setting - mislead users. Timers need to be changed through categories
- Improved German translation