Add Luxembourgish spellchecking dictionary

Change-Id: I9b9135db730443315dff3e1c347886aa9528b208
diff --git a/overlay/dictionaries/packages/inputmethods/LatinIME/java/res/raw/main_lb.dict b/overlay/dictionaries/packages/inputmethods/LatinIME/java/res/raw/main_lb.dict
new file mode 100644
index 0000000..56fd0cd
--- /dev/null
+++ b/overlay/dictionaries/packages/inputmethods/LatinIME/java/res/raw/main_lb.dict
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