Fix German translation for the comment summary in "Confluence Like Plugin"

Current state (4.2), keys are only used in com.atlassian.confluence.plugins.like.DefaultLikeSummaryCreator:

likes.summary.word.you + likes.summary.word.like + likes.summary.word.this + "."
"You like this."
"Du Gefällt mir dies."

"<uref>" + likes.summary.word.likes + likes.summary.word.this + "."
"<uref> likes this."
"<uref> Gefällt mir dies."

"<ucount>" + likes.summary.word.like + likes.summary.word.this + "."
"<ucount> people like this."
"<ucount> Personen Gefällt mir dies."

likes.summary.word.you + likes.summary.word.and + "<uref>" + likes.summary + "."
"You and <uref> like this."
"Du und <uref> Gefällt mir dies."

likes.summary.word.you + likes.summary.word.and + "<ucount>" + likes.summary.word.others + likes.summary.word.like + likes.summary.word.this + "."
"You and <ucount> others like this."
"Du und <ucount> andere Gefällt mir dies."

likes.summary.word.you + ", <uref> " + likes.summary.word.and + " <uref2> " + likes.summary.word.like + likes.summary.word.this + "."
"You, <uref> and <uref2> like this."
"Du, <uref> und <uref2> Gefällt mir dies."

likes.summary.word.you + ", <uref> " + likes.summary.word.and + " <uref2> " + likes.summary.word.and + " <ucount> " + likes.summary.word.others + likes.summary.word.like + likes.summary.word.this + "."
"You, <uref>, <uref2> and <ucount> others like this."
"Du, <uref>, <uref2> und <ucount> andere Gefällt mir dies."