1.18.2: Update environment and fix spelling error in German

Bug fixes:

• lib-french-revolutionary-calendar: 1.8.0 -> 1.8.2
  https://github.com/caarmen/french-revolutionary-calendar/blob/master/CHANGELOG.md

  1.8.2 (2018-07-04)

  • Update to Kotlin 1.2.51
  • Issue #21: Fix misspelling of german word Wiesenmonat for Prairial.
    1.8.1 (2018-04-01)
  • Fixed VonMadler calculation errors in time zones other than Paris.
  • Fixed Romme calculations after 23:00 in some time zones.

Update environment:

• kotlin: 1.1.51 -> 1.2.51
• support lib: 25.3.1 -> 27.1.1
• android gradle plugin: 2.3.3 -> 3.1.3
• compileSdkVersion: 26 -> 27
• targetSdkVersion: 26 -> 27
• ben-manes: 0.15.0 -> 0.20.0

Remove some unnecessary gradle configuration to "filter resources".

1.18.1: Kotlin

• Rewrote the app in Kotlin.
• Also: Use the roman numeral setting in the converter.

1.18.0 Add Basque translations

Also fix the selection of the default font.

1.17.4: Fix spelling of Sansculotides

Fixed spelling of Sansculotides, to match the spelling in the original decree

1.17.3: Fix Oreo compatibility issues

1.17.3: Fix Oreo compatibility bugs

• Issue 43: Widget stuck in spinner loading animation on Oreo
• Issue 45: Notification not created on Oreo

1.17.2: Fix crash in date converter

release-1.17.2

1.17.2: Fix crash in new date converter.

1.17.1: Two-way converter

Convert both ways, between the revolutionary and Gregorian dates, in the same screen.
This is only for 3.x and higher. Older Android devices will still use the old converter.

1.17.0: French to Gregorian converter.

release-1.17.0

1.17.0: Added French to Gregorian date converter.

1.16.0: Kotlin and font change

• Use the kotlin version of lib-french-revolutionary-calendar
• Replace the OpenSans font by the Roboto font

1.15.2: Fixed spelling error.

release-1.15.2

1.15.2: Fixed spelling error.