Removing some hardcoded strings

[KevinMinions]

Commits from @Mazda-- Prevent white screen while launching Settings Remove unnessary check for Jelly Bean

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Removing some hardcoded strings.

There are still many hardcoded strings:

• https://github.com/SecUSo/privacy-friendly-netmonitor/blob/master/app/src/main/java/org/secuso/privacyfriendlynetmonitor/Assistant/Const.java
• https://github.com/SecUSo/privacy-friendly-netmonitor/blob/master/app/src/main/java/org/secuso/privacyfriendlynetmonitor/ConnectionAnalysis/Collector.java