trans: add page (#1590)

pages/common/trans.md

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+# trans
+
+> Translate Shell is a command-line translator.
+
+- Translate a word (language is detected automatically):
+
+`trans "{{word_or_sentence_to_translate}}"`
+
+- Get a brief translation:
+
+`trans --brief "{{word_or_sentence_to_translate}}"`
+
+- Translate a word into french:
+
+`trans :{{fr}} {{word}}`
+
+- Translate a word from German to English:
+
+`trans {{de}}:{{en}} {{Schmetterling}}`
+
+- Behave like a dictionary to get the meaning of a word:
+
+`trans -d {{word}}`