Add macros to install translated artifacts for KF5
Those macros can be injected by release scripts, but we are moving towards having them in the code directly. Moreover it would be more complicated to inject them in the main CMakeLists.txt due to the current hybrid nature of the umbrello code (it would require an extra "if" for the KF5 case). Please note that both functions are noop if the po/ directory does not exist, so the default behavior is untouched.
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