Corrected copyright headers

app/build.gradle.kts

app/src/debug/res/values-de/strings.xml

app/src/debug/res/values/colors.xml

app/src/debug/res/values/strings.xml

app/src/main/AndroidManifest.xml

...ava/de/kuschku/quasseldroid/util/helper/IntRangeHelper.kt

...uschku/quasseldroid/util/ui/BetterLinkMovementMethod.java

...a/de/kuschku/quasseldroid/util/ui/ColorChooserDialog.java

...in/java/de/kuschku/quasseldroid/util/ui/TextDrawable.java

app/src/main/res/drawable-ldrtl/ic_send.xml

app/src/main/res/drawable-v21/bg_menuitem_dark.xml

app/src/main/res/drawable-v21/bg_menuitem_light.xml

app/src/main/res/drawable-v21/bg_menuitem_rounded_dark.xml

app/src/main/res/drawable-v21/bg_menuitem_rounded_light.xml

app/src/main/res/drawable-v26/ic_launcher_background.xml

app/src/main/res/drawable/bg_badge.xml

app/src/main/res/drawable/bg_intro.xml

app/src/main/res/drawable/bg_menuitem_dark.xml

app/src/main/res/drawable/bg_menuitem_light.xml

app/src/main/res/drawable/bg_menuitem_rounded_dark.xml