Add friendicaci/transifex image

transifex/Dockerfile

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+FROM ubuntu:20.04
+
+RUN apt-get update -q && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -q -y \
+        gettext \
+        git \
+    && apt-get clean \
+    && rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/*
+
+COPY check-messages.sh /check-messages.sh

transifex/check-messages.sh

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+#!/bin/bash
+#
+# Checks the default messages.po file
+#
+
+# Skip first 4 lines in possible diff, because they're header
+# Skip all lines of the git diff starting with "@@" or comments or starting "POT-Creation-Date"
+if [[ $(git diff -U0 ./view/lang/C/messages.po | grep -vE '^(@@|\-"POT-Creation-Date|\+"POT-Creation-Date|\-#|\+#)' | wc -l) -gt 4 ]]; then
+	echo "$(git diff ./view/lang/C/messages.po)"
+	exit 1
+else
+	echo "Nothing to update"
+fi