Add Brazilian Portuguese (pt) translation- #729

Rules/Languages/pt/SharedRules/calculus.yaml

@@ -0,0 +1,61 @@
+---
+
+- name: divergence
+  tag: divergence
+  match: "count(*) = 1"
+  replace:
+  # CORREÇÃO: a polaridade estava invertida — o modo padrão (Medium) ouvia a
+  # abreviação "div"; o nome completo só saía no Verbose. No inglês, só o
+  # Terse abrevia. E o "de" era incondicional, contrariando TerseFunctionNames
+  # (divergence/curl/gradient não dizem "de" no modo conciso).
+  - test:
+      if: "$Verbosity='Terse'"
+      then: [T: "div"]
+      else: [T: "divergente de"]
+  - test:
+      if: "not(IsNode(*[1], 'leaf'))"
+      then: [pause: short]
+  - x: "*[1]"
+
+- name: curl
+  tag: curl
+  match: "count(*) = 1"
+  replace:
+  - T: "rotacional"      # phrase(the 'curl of' a field)
+  - test:
+      if: "$Verbosity!='Terse'"
+      then: [T: "de"]
+  - test:
+      if: "not(IsNode(*[1], 'leaf'))"
+      then: [pause: short]
+  - x: "*[1]"
+
+- name: gradient
+  tag: gradient
+  match: "count(*) = 1"
+  replace:
+  - test:
+      if: "$Verbosity!='Terse'"
+      then: [T: "gradiente de"]      # phrase('divergence' from the mean)
+      else: [T: "nabla"]      # phrase('divergence' from the mean)
+  - test:
+      if: "not(IsNode(*[1], 'leaf'))"
+      then: [pause: short]
+  - x: "*[1]"
+
+
+- name: laplacian
+  tag: laplacian
+  match: "count(*) <= 1"   # can be on ∇^2 or on enclosing mrow
+  replace:
+  - T: "laplaciano"
+  - test:
+      if: "count(*) = 1"
+      then:
+      - test:
+          if: "$Verbosity!='Terse'"
+          then: [T: "de"]
+      - test:
+          if: "not(IsNode(*[1], 'leaf'))"
+          then: [pause: short]
+      - x: "*[1]"