Some work on localization / various small quality of life improvements

src/main/java/de/hhu/ba/yoshikoWrapper/CyActivator.java

...ain/java/de/hhu/ba/yoshikoWrapper/core/AlgorithmTask.java

src/main/java/de/hhu/ba/yoshikoWrapper/core/CyCore.java

...va/de/hhu/ba/yoshikoWrapper/core/LocalizationManager.java

...ain/java/de/hhu/ba/yoshikoWrapper/core/YoshikoLoader.java

...n/java/de/hhu/ba/yoshikoWrapper/gui/LanguageSwitcher.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/LibraryPanel.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/MainPanel.java

...in/java/de/hhu/ba/yoshikoWrapper/gui/MainPanelAction.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/SolutionTab.java

...ain/java/de/hhu/ba/yoshikoWrapper/gui/SolutionsPanel.java

src/main/resources/YoshikoStrings.properties

src/main/resources/yoshiko