Fixes #2032 Fixes crash which occurred in the oscilloscope #2102
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Fixes #2032
Changes: Use join method of Apache StringUtils instead of the join method of the Android String class. The join method was added to the String class of Android in API level 26, but the minimum API level of the app is 23.
Checklist:
strings.xml
,dimens.xml
orcolors.xml
APK for testing: app-fdroid-debug.zip