For Hindi, I recommend removing UChicago and Hindi-English.org. The former doesn't seem to pick up even basic Hindi words like प्यार or कसम. The latter doesn't seem to be working at all.
I recommend adding these for Hindi (%s used as a search wildcard):
https://www.boltidictionary.com/en/search?s=%s
https://dict.hinkhoj.com/shabdkhoj.php?word=%s
https://en.wiktionary.org/wiki/%s#Hindi
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Note that for Spanish, I use the Wordreference dictionary, which is the best and cleanest Esp -> Eng one in my opinion. However, the search URL used for it could use some tweaking, because right now if it finds a word that also exists in English, it shows Eng -> Esp definitions instead of Esp -> Eng. You can test this with the word 'halo' in Spanish.
This is the URL I used in a previous app: https://www.wordreference.com/es/en/translation.asp?spen=%s
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For Japanese, I recommend switching from Jisho to JPDB.io (https://jpdb.io), which has the same dictionary as Jisho, but offers more learner-relevant information per word, such as pitch accents, example sentences, and so on.
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For Urdu, you can use Rekhta and Wiktionary:
https://rekhtadictionary.com/search?keyword=%s
https://en.wiktionary.org/wiki/%s#Urdu
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Look it's a Sunday, I have plenty of time, let me have this. Here's Gujarati dictionaries (I test each one):
https://www.gujaratilexicon.com/dictionary/gujarati-to-english-translation/%s/
https://rekhtagujarati.org/gujarati-dictionary/meaning-of-%s
https://www.shabdkosh.com/search-dictionary?lc=gu&sl=en&tl=gu&e=%s
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Punjabi dictionaries:
https://dic.learnpunjabi.org/default.aspx (No search URL available)
https://www.srigranth.org/servlet/gurbani.dictionary (No search URL available)
https://dsal.uchicago.edu/cgi-bin/app/singh_query.py?qs=%s&searchhws=yes&matchtype=default
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Bengali dictionaries:
https://en.glosbe.com/bn/en/%s
https://www.shabdkosh.com/search-dictionary?lc=bn&sl=en&tl=bn&e=%s
https://dsal.uchicago.edu/cgi-bin/app/bengali_query.py?qs=%s&searchhws=yes&matchtype=default
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Tamil dictionaries:
https://www.shabdkosh.com/search-dictionary?lc=ta&sl=en&tl=ta&e=%s
https://glosbe.com/ta/en/%s
https://agarathi.com/word/%s
https://dsal.uchicago.edu/cgi-bin/app/tamil_query.py?qs=%s&searchhws=yes&matchtype=default
https://dictionary.tamilcube.com/dictioanry-search-results/?term=%s
https://www.tamildict.com/tamilsearch.php?action=search&tmode=on&word=%s&cmd=_s-xclick&hosted_button_id=6174245
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Kannada dictionaries:
https://www.shabdkosh.com/search-dictionary?lc=kn&sl=kn&tl=en&e=%s
https://en.glosbe.com/kn/en/%s
https://alar.ink/dictionary/kannada/english/%s
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Telugu dictionaries:
https://andhrabharati.com/dictionary/index.php?w=%s
https://dictionary.tamilcube.com/telugu-dictionary/?term=%s
https://dsal.uchicago.edu/cgi-bin/app/telugu_query.py?qs=%s&searchhws=yes&matchtype=default
https://www.shabdkosh.com/search-dictionary?lc=te&sl=en&tl=te&e=%s
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Malayalam dictionary:
https://glosbe.com/ml/en/%s