Support PARSE_ESCAPES in lang files

[pha3l]

When using the multiline feature in lang files, aka:

#PARSE_ESCAPES

message.mymod.my_message=\
    @aFirstLineText: %d\n\
    @aSecondLineText: %d \n\
    @fAnotherLine

An error "Translations must not contain incomplete entries" is displayed on the subsequent lines. Additionally, the feature that shows the localized output in the code does not work properly with this construct.

I'm using 2018.1-1.2.5 on IntelliJ 2018.1.

Thank you for the awesome plugin!

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