Stable version of settings branch. To-Do: Add contribution graph
Fix 4 warnings about segue. Try to make the voice feedback more natural.
Alter 3-rd libraries PNChart and TEAChart. Now contribution graph is available.
Finish a new feature about stats. Now can display the duration of the last 7 weeks, respectively.
To-Do: Localize for French.
Almost finish French localization. Commit before preparing for merge into master.