Make dependency on KI18n explicit

It already pulled in by KParts, but we better not rely on that

CMakeLists.txt

@@ -81,6 +81,7 @@ find_package(KF5AkonadiSearch ${AKONADI_SEARCH_VERSION} CONFIG REQUIRED)
 set_package_properties(KF5AkonadiSearch PROPERTIES DESCRIPTION "The Akonadi Search libraries" URL "https://www.kde.org" TYPE REQUIRED PURPOSE "Provides search capabilities in KMail and Akonadi")
 
 # Find KF5 package
+find_package(KF5I18n ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5Codecs ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5Config ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5ConfigWidgets ${KF5_MIN_VERSION} CONFIG REQUIRED)

src/kontactplugin/korganizer/CMakeLists.txt

@@ -37,7 +37,7 @@ qt5_add_dbus_interfaces(kontact_journalplugin_PART_SRCS ${korganizer_SOURCE_DIR}
 
 add_library(kontact_journalplugin MODULE ${kontact_journalplugin_PART_SRCS})
 
-target_link_libraries(kontact_journalplugin  KF5::KontactInterface KF5::WindowSystem)
+target_link_libraries(kontact_journalplugin KF5::I18n KF5::KontactInterface KF5::WindowSystem)
 
 kcoreaddons_desktop_to_json(kontact_journalplugin journalplugin.desktop)