Update cheatsheets

tldr/argos-translate

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# argos-translate
+
+> An open-source offline translation library and CLI tool written in Python.
+> More information: <https://www.argosopentech.com/>.
+
+- Install translation pairs for Spanish to English translation:
+
+`argospm install translate-es_en`
+
+- Translate some text from Spanish (`es`) to English (`en`) (Note: only two letter language codes are supported):
+
+`argos-translate --from-lang es --to-lang en {{un texto corto}}`
+
+- Translate a text file from English to Hindi:
+
+`cat {{path/to/file.txt}} | argos-translate --from-lang en --to-lang hi`
+
+- List all installed translation pairs:
+
+`argospm list`
+
+- Show translation pairs from English that are available to be installed:
+
+`argospm search --from-lang en`
+
+- Update installed language package pairs:
+
+`argospm update`
+
+- Translate from `ar` to `ru` (Note: this requires the translation pairs `translate-ar_en` and `translate-en_ru` to be installed):
+
+`argos-translate --from-lang ar --to-lang ru {{صورة تساوي أكثر من ألف كلمة}}`

tldr/linux/let

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# let
+
+> Evaluate arithmetic expressions in shell.
+> Supports variables, operators, and conditional expressions.
+> More information: <https://manned.org/let>.
+
+- Evaluate a simple arithmetic expression:
+
+`let "{{result = a + b}}"`
+
+- Use post-increment and assignment in an expression:
+
+`let "{{x++}}"`
+
+- Use conditional operator in an expression:
+
+`let "{{result = (x > 10) ? x : 0}}"`
+
+- Display help:
+
+`let --help`